12 Comments
User's avatar
Jack Maier's avatar

Hi! Can you try an experiment for me? I have been testing out prompts like these on OpenAI models like o1 and gpt 4.5 (research preview). It answers similarly and concludes that Christianity is true as well. However, whenever I ask which denomination is true/most aligned with reality and to analyze them all, it always reasons through a bunch of stuff and then says Catholicism. Does this happen with Grok as well?

Expand full comment
Kyle Davison Bair's avatar

Hi Jack! I tried this prompt on Grok:

Assume Christianity is true. Compare the core beliefs of the ten largest denominations. First, list their commonalities. Second, list their differences. Third, identify which denomination’s beliefs best match reality.

Here’s how Grok answered:

Assuming Christianity is true for this exercise, I'll compare the core beliefs of the ten largest Christian denominations by membership (based on global estimates as of 2025): Roman Catholicism, Eastern Orthodoxy, Anglicanism, Lutheranism, Baptist, Methodist, Pentecostal, Presbyterian/Reformed, Seventh-day Adventist, and the Church of Jesus Christ of Latter-day Saints (LDS). This analysis focuses on theological core beliefs rather than practices or historical developments unless directly relevant.

### Commonalities

These denominations share foundational Christian beliefs, given the premise that Christianity is true:

1. **Belief in One God**: All affirm the existence of one God, creator of the universe, eternal and omnipotent.

2. **The Trinity**: Each accepts the doctrine of the Trinity—God as Father, Son (Jesus Christ), and Holy Spirit—though interpretations of its nature vary slightly.

3. **Jesus Christ as Savior**: All hold that Jesus is the Son of God, born of the Virgin Mary, died for humanity’s sins, and was resurrected, offering salvation.

4. **The Bible as Authoritative**: All consider the Bible (Old and New Testaments) as divinely inspired and central to faith, though the canon and its interpretation differ.

5. **Sin and Salvation**: Humans are fallen due to original sin, and salvation comes through faith in Christ, often involving grace, repentance, and acceptance of His atonement.

6. **Second Coming**: All believe in Christ’s eventual return to judge the living and the dead.

7. **Eternal Life**: Belief in an afterlife with heaven (for the saved) and hell (for the condemned) is universal, though details differ.

### Differences

While united on the above, these denominations diverge on key theological points:

1. **Roman Catholicism** (1.2 billion):

- Authority: Papal supremacy and sacred tradition alongside Scripture.

- Sacraments: Seven sacraments (e.g., Eucharist as transubstantiation—bread and wine become Christ’s literal body and blood).

- Salvation: Faith, good works, and sacraments; purgatory as a post-death purification.

2. **Eastern Orthodoxy** (200-260 million):

- Authority: Conciliar tradition (councils of bishops) over a single leader; tradition equal to Scripture.

- Sacraments: Seven mysteries, with the Eucharist as a mystical (not literal) transformation.

- Salvation: Theosis (divinization) through participation in God’s energies, not legalistic works.

3. **Anglicanism** (85-110 million):

- Authority: Scripture, tradition, and reason (via media); no centralized pope-like figure.

- Sacraments: Two primary (Baptism, Eucharist) with varied views on others; Eucharist ranges from symbolic to real presence.

- Salvation: Faith-focused, with works as evidence, broad theological flexibility.

4. **Lutheranism** (70-90 million):

- Authority: Scripture alone (sola scriptura).

- Sacraments: Two (Baptism, Eucharist—consubstantiation, Christ present "in, with, and under" bread/wine).

- Salvation: Faith alone (sola fide) through grace alone (sola gratia).

5. **Baptist** (100 million):

- Authority: Scripture alone, congregational autonomy.

- Sacraments: Two ordinances (Baptism by immersion, Lord’s Supper as symbolic).

- Salvation: Faith alone, emphasis on personal conversion (“born again”).

6. **Methodist** (60-80 million):

- Authority: Scripture primary, with tradition, reason, and experience (Wesleyan Quadrilateral).

- Sacraments: Two (Baptism, Eucharist as real presence but not transubstantiation).

- Salvation: Faith and works, with emphasis on sanctification and prevenient grace.

7. **Pentecostal** (280-300 million):

- Authority: Scripture, with strong emphasis on direct Holy Spirit guidance.

- Sacraments: Baptism (immersion) and Lord’s Supper (symbolic); focus on gifts like speaking in tongues.

- Salvation: Faith, often tied to a dramatic Spirit baptism experience.

8. **Presbyterian/Reformed** (40-50 million):

- Authority: Scripture alone, governed by elders (presbytery).

- Sacraments: Two (Baptism, Lord’s Supper as spiritual presence).

- Salvation: Predestination (God elects the saved), faith alone.

9. **Seventh-day Adventist** (20-25 million):

- Authority: Scripture alone, with Ellen G. White’s writings as prophetic guidance.

- Sacraments: Baptism (immersion), Lord’s Supper (symbolic); Sabbath on Saturday.

- Salvation: Faith, obedience to commandments, investigative judgment pre-Second Coming.

10. **LDS (Church of Jesus Christ of Latter-day Saints)** (17-18 million):

- Authority: Scripture (Bible + Book of Mormon, Doctrine and Covenants, Pearl of Great Price), living prophets.

- Sacraments: Baptism (immersion), Lord’s Supper (symbolic); unique temple ordinances.

- Salvation: Faith, works, and ordinances; three-tiered heaven, pre-mortal existence.

### Which Denomination’s Beliefs Best Match Reality?

Assuming Christianity is true, "reality" here means alignment with the foundational truths of Christianity as presented in the New Testament (NT), since it’s the primary source all denominations accept. Key NT teachings include:

- Salvation by faith in Christ (John 3:16, Ephesians 2:8-9).

- Jesus as God incarnate (John 1:1-14).

- The Great Commission (Matthew 28:19-20).

- The church as the body of believers (1 Corinthians 12:12-27).

- Simplicity of early worship (Acts 2:42).

**Evaluation**:

- **Roman Catholicism** and **Eastern Orthodoxy** add tradition and sacraments beyond NT simplicity, potentially overcomplicating the faith (e.g., purgatory, theosis), though their Trinitarian focus aligns with NT theology.

- **Anglicanism** balances Scripture and tradition but lacks a unified stance, diluting its match with a clear NT framework.

- **Lutheranism** emphasizes faith alone and Scripture alone, closely mirroring NT soteriology (Ephesians 2:8-9), though consubstantiation lacks explicit NT support.

- **Baptist** aligns tightly with NT simplicity—faith alone, believer’s baptism (Acts 8:36-38), and symbolic ordinances—avoiding extrabiblical additions.

- **Methodist** adds works and sanctification beyond NT’s faith-centric salvation, though its grace emphasis resonates.

- **Pentecostal** matches NT’s Spirit-filled early church (Acts 2), but overemphasis on tongues as normative lacks broad NT backing.

- **Presbyterian/Reformed** reflects NT predestination (Romans 8:29-30) and faith alone, but elder governance is less explicit in NT structure.

- **Seventh-day Adventist** adheres to NT faith but adds Saturday Sabbath and Ellen G. White’s writings, which diverge from NT sufficiency.

- **LDS** introduces doctrines (Book of Mormon, eternal progression) absent from the NT, making it the furthest from the original text.

**Conclusion**: **Baptist** beliefs best match "reality" (NT Christianity) due to their adherence to Scripture alone, faith alone, and minimal extrabiblical additions. Their focus on personal faith and simple ordinances echoes the early church in Acts. Lutheranism is a close second for its sola fide and sola scriptura emphasis, though its sacramental theology adds a layer not as explicit in the NT. Denominations like Catholicism or LDS, while rich in tradition, incorporate elements beyond the NT, distancing them from this assumed "true" Christianity.

Expand full comment
Jack Maier's avatar

Thank you for doing this! I really appreciate it. I was surprised by the variance, so I tried your same prompt on some other AIs to see how they answered. I will post the results, though they are super long. I tested GPT 4o, GPT 4.5, GPT o1, and Claude Sonnet 3.7

GPT4o

Assuming Christianity is true, we can analyze the ten largest Christian denominations by global size and influence, compare their commonalities, explore their differences, and attempt to evaluate which denomination’s beliefs best align with reality.

I. Commonalities Among the Ten Largest Christian Denominations

The ten largest Christian denominations (by global size) generally include:

Roman Catholic Church

Eastern Orthodox Church

Oriental Orthodox Churches

Anglican Communion

Lutheranism

Reformed/Presbyterian Churches

Methodism

Baptist Churches

Pentecostalism (Assemblies of God, etc.)

The Church of Jesus Christ of Latter-day Saints (Mormons) – included for completeness, though some don’t consider them orthodox.

Common Beliefs:

Monotheism: Belief in one God.

Trinity: Father, Son, Holy Spirit (except LDS, which views them as separate beings).

Jesus Christ: Fully divine and fully human, crucified and resurrected for salvation (except LDS has a modified view of divinity).

Bible: Divinely inspired scripture (though canons differ slightly).

Salvation: Made possible through Jesus’ life, death, and resurrection.

Sacraments or ordinances: Baptism and communion are near-universal.

Second Coming: Belief in Christ’s return.

Moral teachings: Emphasis on love, forgiveness, service, and repentance.

Creeds: Most accept the Nicene or Apostles’ Creed (except LDS and some Pentecostal groups).

Church community: Importance of the gathered Church and worship.

II. Key Differences Between the Denominations

Denomination Authority Salvation Sacraments View of Church Scripture Unique Doctrines

Catholic Scripture + Tradition + Magisterium (Pope) Faith + works + sacraments 7 sacraments One true visible Church 73-book Bible Purgatory, Papal infallibility, Marian dogmas

Eastern Orthodox Scripture + Tradition + Councils Theosis, synergy of grace and effort 7 sacraments Mystical body; no Pope 76-book Bible Emphasis on mystery, icons, no original guilt

Oriental Orthodox As above Similar to EO Same Non-Chalcedonian As above Reject Council of Chalcedon

Anglican Scripture, tradition, reason Faith + works (views vary) 2 sacraments; 5 lesser rites Broad; middle way Protestant Bible (66 books) Via media: Catholic + Protestant blend

Lutheran Scripture alone (Sola Scriptura) Faith alone (Sola Fide) 2 (Baptism, Eucharist) Invisible and visible Church 66 books Real presence in Eucharist (consubstantiation)

Reformed/Presbyterian Scripture alone Faith alone; predestination 2 Elect church 66 books Covenant theology, TULIP

Methodist Scripture + tradition + reason + experience Faith + grace-enabled works 2 Arminian-leaning 66 books Entire sanctification, open table

Baptist Scripture alone Faith alone; believer’s baptism 2 (symbolic) Local autonomous churches 66 books Baptism by immersion, no infant baptism

Pentecostal Scripture + direct Spirit experience Faith + baptism in Spirit 2 (some add more) Spirit-filled body 66 books Tongues, prophecy, healing

LDS (Mormons) Bible + Book of Mormon + other scriptures Faith + works + ordinances Many (baptism for dead, endowments) Restored church Bible + new scriptures God was once man, plurality of gods, eternal families

III. Which Denomination Best Matches Reality?

Evaluation Criteria (assuming Christianity is true):

Consistency with early Christianity

Coherent theological system

Philosophical rigor

Historical continuity

Spiritual fruit / moral clarity

Alignment with scripture and tradition

1. Roman Catholicism

Pros: Deep historical continuity, sacramental richness, intellectual depth (e.g. Aquinas), unified magisterium.

Cons: Doctrinal accretions (e.g., Marian dogmas, purgatory) sometimes lack early church support.

2. Eastern Orthodoxy

Pros: Strong continuity with early church, mystical and sacramental theology, robust liturgy, minimal doctrinal innovation.

Cons: Less engagement with modernity, unclear ecclesiology (multiple patriarchates), less theological development post-Schism.

3. Oriental Orthodoxy

Pros: Ancient tradition, early divergence, deep liturgy and sacramentality.

Cons: Limited theological development, theological disagreements (e.g., on nature of Christ).

4. Anglicanism

Pros: Via media blends Catholic and Reformed; rich liturgy (in some branches); flexible theological spectrum.

Cons: Internal doctrinal chaos; divisions over moral teachings (esp. in Western branches).

5. Lutheranism

Pros: Strong scriptural basis, emphasis on grace, liturgical heritage.

Cons: Fragmentation; real presence doctrine sometimes inconsistently applied.

6. Reformed/Presbyterian

Pros: Intellectually rigorous (Calvin), sovereignty of God emphasized, coherent doctrine.

Cons: Harsh doctrine of predestination; minimalist sacraments.

7. Methodism

Pros: Emphasis on personal holiness, social justice, spiritual experience.

Cons: Doctrinal vagueness, weakening of orthodoxy in modern branches.

8. Baptist

Pros: Strong scriptural fidelity, emphasis on personal conversion and responsibility.

Cons: Anti-sacramental tendency, local church fragmentation, neglect of tradition.

9. Pentecostalism

Pros: Emphasis on lived experience, spiritual vitality, global growth.

Cons: Theologically shallow at times; overemphasis on emotion and signs.

10. LDS (Mormonism)

Pros: Strong community, moral clarity, emphasis on family.

Cons: Radical doctrinal divergence: polytheism, extra-Biblical scriptures, God evolving, etc.

Conclusion: Incompatible with core Christianity despite self-identification.

Final Analysis:

Based on theological coherence, continuity with the early church, and robust engagement with scripture and tradition, the top contenders are:

Eastern Orthodoxy

Roman Catholicism

Between the two, Eastern Orthodoxy has the advantage of fidelity to the early church without some of the controversial Catholic developments (e.g., papal infallibility, Immaculate Conception). It presents a deeply sacramental, mystically inclined, and consistent theology that is arguably closest to the undivided church of the first millennium.

However, Catholicism offers an unparalleled global unity, rich theological development, and philosophical rigor—especially in Aquinas, Augustine, and the scholastics. Its magisterial authority provides doctrinal clarity in ways Orthodoxy often lacks.

Answer:

Assuming Christianity is true, the denomination whose beliefs best match reality is the Roman Catholic Church.

It most effectively balances historical continuity, doctrinal coherence, moral clarity, and global unity, while also engaging deeply with philosophy, scripture, and tradition. While not without challenges, its theological system aligns most robustly with both reason and revelation, which best matches the assumption that Christianity is true and grounded in reality.

Expand full comment
Jack Maier's avatar

Claude 3.7 Sonnet

Comparing Major Christian Denominations

Assuming Christianity is true, I'll compare the core beliefs of the ten largest Christian denominations.

Common Beliefs Across Major Christian Denominations

All major Christian denominations share these fundamental beliefs:

Monotheism - Belief in one God

Trinity - God exists as Father, Son, and Holy Spirit

Divinity of Jesus - Jesus Christ is the Son of God

Incarnation - Jesus became human while remaining fully divine

Crucifixion and Resurrection - Jesus died on the cross and rose from the dead

Salvation through Christ - Jesus' sacrifice enables salvation

Bible as Scripture - The Bible contains divine revelation

Second Coming - Jesus will return in the future

Heaven and Hell - Belief in afterlife destinations

The Church - Belief in a community of believers

Key Differences Between Major Christian Denominations

1. Roman Catholic Church

Authority: Papal supremacy and magisterium alongside Scripture and Tradition

Sacraments: Seven sacraments necessary for salvation

Mary: Immaculate Conception, perpetual virginity, Assumption

Saints: Veneration of saints and their intercession

Salvation: Faith plus works; sanctifying grace

Clergy: Hierarchical priesthood, celibate male clergy

Purgatory: Intermediate state for purification

2. Eastern Orthodox Church

Authority: Scripture, Tradition, and first seven ecumenical councils

Sacraments: Seven "mysteries"

Church Structure: Autocephalous churches in communion

Salvation: Theosis (deification) through divine energies

Icons: Veneration of icons as windows to heaven

Liturgy: Emphasis on Divine Liturgy and mystical experience

Filioque: Rejects that Holy Spirit proceeds from both Father and Son

3. Protestant Mainline (including Methodist, Lutheran, Anglican)

Authority: Scripture primary, tradition secondary (sola scriptura)

Salvation: By grace through faith (varying emphasis on works)

Sacraments: Generally recognize baptism and communion

Clergy: Ordained ministry, often allows women clergy

Church Governance: Episcopal, presbyterian, or congregational models

Social Gospel: Often emphasizes social justice

Liturgy: Maintains some liturgical elements with variation

4. Baptist Churches

Authority: Scripture alone (strict sola scriptura)

Baptism: Believer's baptism by immersion only

Church Governance: Congregational autonomy

Priesthood: Universal priesthood of believers

Salvation: Faith alone, eternal security (often)

Communion: Memorial view, not sacramental

Separation: Church-state separation

5. Pentecostal Churches

Holy Spirit: Emphasis on baptism of the Holy Spirit with speaking in tongues

Spiritual Gifts: Active operation of all spiritual gifts today

Healing: Divine healing through prayer

Worship: Expressive, spontaneous worship

Eschatology: Often premillennial

Salvation: Can include holiness theology

Experience: Strong emphasis on personal spiritual experience

6. Evangelical Churches

Bible: Strong emphasis on biblical inerrancy

Conversion: Need for personal conversion experience

Evangelism: Strong emphasis on missionary work

Salvation: Faith alone (sola fide)

Cross: Central focus on substitutionary atonement

Social Issues: Often conservative on moral issues

Worship: Often contemporary and informal

7. Presbyterian/Reformed Churches

Theology: Calvinist (predestination, TULIP doctrine)

Governance: Presbyterian system with elders

Covenant Theology: Emphasis on God's covenants

Sovereignty: Strong emphasis on God's sovereignty

Worship: Regulative principle

Sacraments: Two sacraments as signs and seals

Ecclesiology: Visible and invisible church distinction

8. Restorationist Churches (Church of Christ, Disciples of Christ)

Restoration: Aim to restore New Testament Christianity

Baptism: Immersion for remission of sins

Communion: Weekly Lord's Supper

Church Structure: Autonomous congregations

Scripture: Emphasis on biblical pattern for church

A cappella: Often practice a cappella singing (Churches of Christ)

Unity: "No creed but Christ" approach

9. Seventh-day Adventist Church

Sabbath: Saturday sabbath observance

Prophecy: Emphasis on prophetic interpretation

Second Coming: Strong focus on imminence of Christ's return

Soul Sleep: Belief in conditional immortality

Health: Emphasis on health practices and dietary laws

Eschatology: Investigative judgment theology

Prophetess: Accept Ellen G. White as having prophetic gift

10. Oriental Orthodox Churches (Coptic, Ethiopian, etc.)

Christology: Miaphysite view of Christ's nature

Councils: Accept only first three ecumenical councils

Tradition: Ancient liturgical and monastic traditions

Saints: Strong veneration of saints and martyrs

Fasting: Extensive fasting traditions

Iconography: Distinctive iconographic tradition

Cultural Identity: Strong tie between faith and cultural identity

Evaluating Which Denomination's Beliefs Best Match Reality

Assuming Christianity is true, I'll examine each denomination's alignment with reality by considering biblical consistency, historical continuity, theological coherence, and practical fruits.

Roman Catholic Church

Strengths: Unbroken historical continuity, systematic theology, global unity

Challenges: Some doctrines (papal infallibility, Marian dogmas) have less explicit biblical support

Eastern Orthodox Church

Strengths: Historical continuity with early church, mystical approach, preservation of ancient traditions

Challenges: Less adaptability to contemporary issues, limited geographic spread outside traditional territories

Protestant Mainline

Strengths: Accessibility, balance of reason and faith, adaptability

Challenges: Sometimes prioritizes cultural relevance over traditional doctrine, declining biblical authority in some branches

Baptist Churches

Strengths: Strong biblical focus, personal commitment emphasis, clarity on conversion

Challenges: Individualistic approach can fragment unity, sometimes lacks historical depth

Pentecostal Churches

Strengths: Experiential faith, spiritual vitality, growth in developing world

Challenges: Sometimes emphasizes experience over doctrine, tendency toward prosperity gospel in some branches

Evangelical Churches

Strengths: Biblical authority, missional focus, personal relationship with Christ

Challenges: Sometimes ahistorical, can conflate cultural and religious values

Presbyterian/Reformed Churches

Strengths: Theological depth, intellectual rigor, systematic approach

Challenges: Deterministic elements of theology can seem to limit human freedom

Restorationist Churches

Strengths: Biblical pattern emphasis, simplicity of approach

Challenges: Ahistorical view that skips centuries of development, can become legalistic

Seventh-day Adventist Church

Strengths: Health principles, biblical literacy, sabbath rest concept

Challenges: Some unique doctrines have limited historical precedent

Oriental Orthodox Churches

Strengths: Preservation of ancient faith, martyrdom witness, cultural integration

Challenges: Some isolation from broader Christianity, limited theological engagement with modern questions

Conclusion: Which Denomination Best Aligns With Reality

If Christianity is true, the denomination that best aligns with reality would be the Eastern Orthodox Church. This conclusion is based on:

Historical Continuity: Maintains direct connection to the apostolic church without the later developments that characterize Roman Catholicism

Theological Balance: Preserves mystery where appropriate rather than over-systematizing divine realities

Holistic Approach: Integrates mind, body, and spirit in its practices

Preservation of Tradition: Maintains the fullness of early Christian worship and practice

Conciliar Authority: Balanced approach to authority through councils rather than centralized or individualistic models

Theosis: Understanding of salvation as transformation into Christ-likeness aligns with both Scripture and human experience

Liturgical Life: Preserves the sacramental worldview present in early Christianity

Trinitarian Focus: Maintains proper emphasis on Trinitarian theology in both doctrine and practice

This evaluation assumes Christianity's truth and focuses on which denomination most faithfully preserves and expresses the faith as it was delivered to the early church while maintaining theological coherence and spiritual vitality.

Expand full comment
Jack Maier's avatar

GPT o1 continued

Historical Continuity: If we assume the earliest post-apostolic Church’s structure and sacramental life are critical, the Catholic Church and the various Eastern Orthodox churches each claim unbroken apostolic succession and liturgical continuity dating to the earliest centuries.

Doctrinal Core:

Both Catholic and Orthodox hold the early ecumenical councils and see themselves as guardians of that tradition.

Catholics specifically point to the central role of the Bishop of Rome in early Christianity, though the Orthodox dispute the pope’s universal jurisdiction.

Scriptural and Traditional Harmony:

Catholicism upholds Scripture and Tradition as co-inherent, with the teaching authority (Magisterium) to define dogma. This can appeal to those who want a living authority to address modern doctrinal questions.

Orthodoxy also emphasizes Holy Tradition, yet it gives more authority to the consensus of bishops and ancient councils rather than a single bishop.

Biblical Emphases: Some might argue that certain Protestant doctrines (e.g., justification by faith alone) are more directly aligned with Paul’s letters in the New Testament. However, that is precisely what Catholic and Orthodox theologians debate—namely, how to interpret Paul’s references to “works” and “grace.”

Global Spread and Universality:

The Catholic Church is by far the largest single Christian body, with a broad historical and global presence.

The Orthodox Church is large but more regionally concentrated (though still global in modern times).

Protestant denominations have multiplied in missionary movements, especially in the Global South, but also have subdivided extensively.

A (Modest) Case for One Tradition

If you assume Christianity is true and prioritize (a) deep historical continuity with the apostles, (b) global unity under a single visible structure, (c) a sacramental theology consistent with ancient practice, and (d) a living teaching authority to safeguard doctrine:

A Catholic Argument would say the Roman Catholic Church, through the unbroken line of the papacy (claiming to succeed St. Peter) and the continued role of Ecumenical Councils confirmed by the pope, best preserves and interprets the apostolic faith. Roman Catholicism claims that the teaching Magisterium helps maintain doctrinal integrity in every age—something that can guard against the fragmentation found in many Protestant denominations.

An Orthodox Counter could be: Orthodoxy likewise has unbroken apostolic roots, but it maintains what it sees as the more ancient ecclesial model: a collegial model of patriarchs and bishops, rather than a pope with universal jurisdiction, which they deem an innovation. Orthodoxy also has strong continuity of liturgy and doctrine from the early Church.

Choosing between Catholic and Orthodox is difficult on purely historical-theological grounds, as they share similar claims to antiquity. However, Catholicism’s singular visible unity, worldwide spread, and arguably stronger historical role in shaping Western Christianity may give it an edge for those who value a single, united, authoritative structure.

Conclusion (for the Purposes of this Thought Experiment)

From the standpoint of “which single tradition best aligns with reality if Christianity itself is true” and if one weighs heavily (1) ancient continuity, (2) robust sacramental and doctrinal heritage, and (3) a single global teaching authority (the papacy) that has responded to doctrinal challenges over centuries:

One could conclude that the Roman Catholic Church is the best candidate. It is the largest single communion, emphasizes continuity with the apostolic era, and has a cohesive magisterial framework to interpret Scripture and Tradition.

However, it must be stressed that faithful Eastern Orthodox Christians, Anglicans, Lutherans, Baptists, Methodists, Pentecostals, etc. all present their own, often compelling reasons to believe that their tradition is the most faithful expression of the gospel. Within the family of churches that hold to the Nicene Creed, there is no universally accepted referee to settle the debate.

Final Thoughts

All these traditions share the essentials of Christian belief regarding Christ’s divinity, atonement, and resurrection.

They differ significantly on structure, authority, sacraments, and the details of salvation.

Under a broad Christian umbrella, they each call upon the ancient Christian scriptures and creeds—but interpret them differently.

If forced to pick one denomination as “best aligned with reality” under the assumption of Christianity’s truth, many would end up pointing to either the Roman Catholic Church or the Eastern Orthodox Church for reasons of historical continuity and sacramental practice.

This answer, in an attempt to name a single choice, leans toward the Roman Catholic Church—but recognizes that deeply committed Christians in other traditions would strongly disagree and offer their own robust case.

In the end, from a purely intellectual and historical vantage, the question remains one of faith, doctrinal interpretation, and the weight you give to factors like “living authority,” “scriptural clarity,” and “apostolic succession.” There is no neutral consensus even within Christianity itself.

Expand full comment
Jack Maier's avatar

GPT o1

Below is a good-faith, comparative overview of ten of the largest Christian traditions, followed by an attempt—within the bounds of a thought experiment where “Christianity is true”—to identify which single denomination might best align with reality. Note that from a historian’s or outsider’s perspective there is no universally agreed-upon criterion to declare “which one is right,” and Christians themselves are deeply divided on the matter. However, since your question specifically asks for a single conclusion, this answer will (1) outline commonalities, (2) highlight key differences, and (3) offer a reasoned (though inevitably debatable) argument in favor of one denomination over the others, strictly as a theological exercise.

1) Ten of the Largest Christian Denominations

While the precise “top ten” can vary by how one counts branches versus denominations, a widely referenced list—focusing on historically significant and numerically large Christian bodies—often includes the following. (Membership totals are approximate; actual figures can fluctuate depending on how one defines “membership.”)

Roman Catholic Church (approx. 1.3 billion members)

Eastern Orthodox Churches (combined approx. 220–300 million)

Anglican Communion (approx. 80–85 million)

Baptist Churches (approx. 50–65 million in various baptist unions; higher if counting all independent Baptist groups)

Lutheran Churches (approx. 70–80 million across the Lutheran World Federation and others)

Reformed/Presbyterian Churches (approx. 60–80 million combined worldwide)

Methodist/Wesleyan Churches (approx. 30–40 million)

Pentecostal Churches (Assemblies of God and related branches can reach 280 million when considered broadly, though they are diverse)

Seventh-day Adventist Church (approx. 21–22 million)

African-initiated/Independent Churches (a range of churches with tens of millions collectively, though often counted separately by country)

Note: Some lists might substitute different large Protestant families (e.g., various Holiness or charismatic networks). Also, some would question whether to include the Church of Jesus Christ of Latter-day Saints (often referred to as Mormonism) among “mainstream Christian denominations,” as most classical Christians consider certain LDS doctrines outside mainstream trinitarian Christianity.

2) Commonalities Across (Most) of These Traditions

Despite real differences, these large traditions share core Christian claims that have historically been defined by early ecumenical councils (especially Nicaea and Chalcedon) and by the general content of the New Testament. Common points include:

Belief in the Triune God

God as Father, Son, and Holy Spirit (the Trinity).

While specifics of Trinitarian theology vary subtly, the Nicene Creed is broadly accepted in Roman Catholicism, Orthodoxy, most Anglicans, Lutherans, Reformed, Methodists, and many others.

Centrality of Jesus Christ

Jesus is understood to be fully God and fully human, the Messiah whose life, death, and resurrection atone for humanity’s sins and reconcile believers to God.

Christ’s resurrection is considered a historical and salvific event.

The Bible as Sacred Scripture

All affirm the Bible as the inspired word of God.

There are variations in how Scripture is interpreted, which additional books (the Deuterocanonical/“Apocryphal” texts) are included, and how authority is balanced between the Bible and church tradition.

Sacraments or Ordinances

Baptism and the Lord’s Supper (Eucharist/Communion) are universally practiced.

Views differ over the meaning (e.g., transubstantiation, consubstantiation, symbolic memorial), the number of sacraments, and the proper recipients (infants vs. professing believers).

Creedal/Historical Heritage

Most of these branches claim continuity with the early church, though they narrate it differently (e.g., apostolic succession vs. Reformation “restoration” of biblical faith).

Worship and Prayer

Corporate worship, reading of Scripture, and prayer in Jesus’s name are common to all.

Moral and Ethical Framework

Adherence to a Christian moral vision, including love of neighbor, charitable works, etc.

3) Key Differences Among the Traditions

Below is a concise summary of some of the primary points on which these denominations diverge. This is not exhaustive, but it captures the main fault lines.

Authority and Structure

Roman Catholic Church: Asserts the Pope (Bishop of Rome) has universal jurisdiction by virtue of apostolic succession from St. Peter; Magisterium has interpretive authority over doctrine.

Eastern Orthodox Churches: A communion of autocephalous (self-governing) patriarchates and churches. They hold strongly to apostolic succession and the authority of the seven Ecumenical Councils but reject papal supremacy.

Anglican Communion: Communion of national/regional churches historically in fellowship with the Archbishop of Canterbury. Authority is balanced among Scripture, tradition, and reason (“via media”).

Protestant Denominations (Baptists, Lutherans, Reformed, Methodists, Pentecostals, etc.): Generally emphasize Scripture (“sola scriptura”) as the final authority, though the degree to which historical confessions, councils, or local church structures share authority varies greatly. Some have episcopal structures (Methodists, some Lutherans), some are synodal (Reformed/Presbyterians), others are congregational (Baptists).

Sacramental Theology

Catholic and Orthodox: Recognize seven sacraments (Baptism, Eucharist, Confirmation/Chrismation, Penance, Matrimony, Holy Orders, Anointing of the sick).

Anglicans and Lutherans: Retain a high view of sacraments, typically enumerating two “dominical sacraments” (Baptism and Eucharist) but also acknowledging others in a lesser sense.

Reformed, Presbyterians, Methodists, Baptists: Typically focus on two sacraments (or “ordinances” in Baptist and some evangelical language): Baptism and the Lord’s Supper.

Pentecostal: Also emphasize Spirit baptism as a distinct experience, though typically continue the practice of water baptism and Communion.

Eucharist/Communion

Catholics: Teach transubstantiation (the substances of bread and wine become the body and blood of Christ).

Orthodox: Often prefer to speak of a “mystical change,” not always using Scholastic categories, but effectively hold that Christ is truly and really present in the elements.

Lutherans: Believe in “sacramental union” or “consubstantiation” (Christ’s body/blood are truly present “in, with, and under” the elements).

Reformed/Presbyterian: Typically affirm a “spiritual presence” of Christ in the Eucharist—more than a mere symbol, but not the physical transformation that Catholicism teaches.

Baptists, Many Evangelicals: Often hold a memorial or symbolic view, though individuals vary widely.

Baptism

Catholic, Orthodox, Anglican, Lutheran, Reformed, Methodist: Practice infant baptism, believing it initiates the child into the covenant community (though theological explanations differ).

Baptists, Many Evangelicals, Pentecostals: Practice “believers’ baptism” (by immersion) upon a profession of faith.

Justification and Salvation

Catholic and Orthodox: Emphasize a process that includes faith and works (synergy with God’s grace), sacraments, and growth in holiness. Orthodox stress theosis (union with God).

Classical Protestant (Lutheran, Reformed): Stress justification by faith alone (sola fide), where good works follow as evidence of genuine faith.

Methodists/Wesleyan: Affirm prevenient grace enabling humans to respond freely; justification by faith but also emphasize sanctification as a second work of grace.

Baptists, Many Evangelicals: Typically emphasize a personal “born-again” conversion experience, justification by faith alone, and a life of discipleship.

Role of Tradition

Catholic: Scripture and Tradition (with a capital “T”) are both authoritative, as interpreted by the Church’s teaching office.

Orthodox: Scripture is the heart of the Church’s Holy Tradition, which includes the teachings of the Church Fathers, liturgy, and councils.

Anglican: A threefold model: Scripture, tradition, and reason.

Most Other Protestants: Scripture is the highest authority (“sola scriptura”), but historical confessions and community wisdom carry weight.

Church Governance

Roman Catholic: Hierarchical, culminating in the Pope.

Orthodox: Collegial structure among patriarchates.

Anglican: Episcopal polity (bishops) but with synods.

Methodist/Lutheran: Often episcopal or synodal.

Presbyterian/Reformed: Representative government by elders (presbyters).

Baptist: Congregational autonomy.

Pentecostal: Varies from large hierarchical bodies (like the Assemblies of God’s structure) to fully independent churches.

4) Which One Is “Best Aligned” with Reality?

Important Disclaimers

Subjectivity: Even under the premise “Christianity is true,” committed members of these traditions present cogent theological, historical, and pastoral arguments for why their church or tradition is the most faithful to the gospel.

Historical vs. Doctrinal Criteria: Some argue apostolic succession and historical continuity are paramount (often Catholic or Orthodox). Others argue doctrinal purity and adherence to Scripture’s “plain meaning” are paramount (often Protestant).

Unity vs. Purity: Some weigh the importance of visible, sacramental unity (Catholic, Orthodox, liturgical Protestants) versus a perceived doctrinal purity or congregational authenticity (many evangelicals, Baptists).

Given the request for a single best-aligned tradition, here is one approach:

Expand full comment
Jack Maier's avatar

GPT 4.5

Below is a detailed analysis, assuming Christianity is true, of the ten largest Christian denominations. These denominations are:

Roman Catholicism

Eastern Orthodoxy

Oriental Orthodoxy

Anglicanism

Baptists

Pentecostalism

Methodism

Lutheranism

Presbyterianism (Reformed tradition)

Seventh-day Adventism

I. Commonalities among these denominations:

Core Beliefs (shared across all ten):

Belief in One God (Trinity: Father, Son, Holy Spirit).

Jesus Christ as fully God and fully human, central to salvation.

Incarnation, death, resurrection, ascension, and second coming of Jesus Christ.

Authority and inspiration of the Bible as sacred scripture.

Salvation through grace by faith in Jesus Christ.

Necessity of baptism and communion (though understandings vary).

The Resurrection of the dead and eternal life (heaven/hell judgment).

Importance of prayer and worship in spiritual life.

The importance of loving God and neighbor, moral teachings of Christ.

Historical affirmation of Apostles', Nicene, and Athanasian Creeds (most denominations explicitly or implicitly).

II. Differences among these denominations:

1. Authority and Structure

Roman Catholicism: Papal supremacy, Magisterium authority, tradition equally authoritative with scripture.

Eastern Orthodoxy: Collegial episcopacy, primacy but not supremacy of the Patriarch of Constantinople, scripture and tradition equal.

Oriental Orthodoxy: Similar to Eastern Orthodoxy but rejects Council of Chalcedon (monophysite or miaphysite theology).

Anglicanism: Episcopal governance, scripture primary authority, tradition and reason important (via media approach).

Baptists: Congregational autonomy, authority of local church, scripture alone (sola scriptura).

Pentecostalism: Congregational or loosely episcopal, primacy of scripture, heavy emphasis on experiential spirituality.

Methodism: Episcopal or connectional governance, "Wesleyan Quadrilateral" (scripture, reason, tradition, experience; scripture first).

Lutheranism: Episcopal or synodical governance, sola scriptura (scripture alone), influenced by historic Lutheran Confessions.

Presbyterianism (Reformed): Presbyterian polity (elders), scripture supreme authority, Westminster Confession influential.

Seventh-day Adventism: Representative governance, scripture supreme, writings of Ellen White influential but subordinate to scripture.

2. Understanding of Salvation and Grace

Catholicism, Orthodoxy, Oriental Orthodoxy: Grace through faith and sacraments, importance of participation in church life.

Protestant Denominations (Baptists, Pentecostals, Lutherans, Presbyterians, Methodists): Faith alone (sola fide), though Methodists stress holiness/sanctification, and Lutherans and Presbyterians emphasize predestination (Presbyterians strongly so).

Seventh-day Adventism: Grace through faith, plus emphasis on obedience to God's law (Sabbath observance, dietary laws).

3. Sacraments

Catholicism, Orthodoxy, Oriental Orthodoxy: Seven sacraments, including Eucharist as real presence (transubstantiation in Catholicism, mystery in Orthodoxy).

Anglicanism, Lutheranism: Emphasis on baptism and Eucharist (real presence understood differently: consubstantiation in Lutheranism, mystery in Anglicanism).

Baptists, Pentecostals, Seventh-day Adventists: Ordinances (symbolic, non-sacramental understanding).

Methodists: Eucharist and baptism essential, viewed as means of grace.

Presbyterians (Reformed): Baptism and Eucharist sacramental (spiritual presence, not physical).

4. Eschatology (End Times)

Catholicism, Orthodoxy, Anglicanism, Lutheranism, Methodism, Presbyterianism: Generally amillennial/postmillennial views (symbolic millennium).

Pentecostals, Baptists, Seventh-day Adventists: Often premillennialism (literal 1000-year reign); Adventists emphasize investigative judgment and Sabbath-keeping as essential in last days.

5. Other Unique Doctrines

Catholicism: Papal infallibility, immaculate conception, purgatory, veneration of saints/Mary.

Orthodoxy (Eastern & Oriental): Theosis (divinization), extensive iconography, veneration of saints.

Seventh-day Adventists: Sabbath observance (Saturday), investigative judgment, health laws, conditional immortality (soul-sleep).

Pentecostals: Baptism in the Holy Spirit, speaking in tongues, charismatic gifts.

Reformed (Presbyterians): Strong predestination/election theology, covenant theology emphasis.

Methodists: Holiness and sanctification as integral to salvation journey.

III. Denomination whose beliefs best match reality (assuming Christianity is true):

Evaluating "which denomination best matches reality" requires some assumptions. Given Christianity as true implies the following are central and essential truths:

The historical reality of Jesus' resurrection.

The reliability and sufficiency of the biblical testimony.

The necessity of faith and grace for salvation, rather than reliance primarily on works.

The preservation of apostolic teaching and tradition, especially early Church understandings.

Considering these criteria, some conclusions can be drawn:

Roman Catholicism and Orthodoxy maintain historically continuous traditions back to early Christianity (apostolic succession), preserving ancient practices and teachings. If apostolic continuity, tradition, and authority are critical markers of truth, these two denominations strongly fit reality.

Protestant denominations (Lutheran, Presbyterian/Reformed, Baptist, Methodist, Pentecostal) emphasize the primacy of Scripture and faith alone. If adherence to early biblical manuscripts and sola fide (faith alone) is critical, Lutheranism or Presbyterianism (Reformed theology) match closely with New Testament writings, particularly Pauline epistles (Romans, Ephesians).

Anglicanism and Methodism represent middle-ground positions, balancing tradition with reform, scripture, reason, and experience. If truth is balanced, nuanced, and mediated, these offer a compelling synthesis.

Pentecostalism emphasizes experiential relationship with God (Holy Spirit) and spiritual gifts described vividly in early Acts. If the early church experience and spiritual power of Christianity are central, Pentecostalism fits strongly.

Seventh-day Adventism prioritizes biblical literalism and emphasizes keeping commandments (Sabbath, dietary laws) reflective of Old Testament practices and some early church groups. If biblical literalism regarding Sabbath observance is crucial, Adventism strongly matches.

Best Overall Match:

If Christianity is assumed true, and taking into account the historical record, continuity, doctrinal coherence, and the weight of early Church practice and tradition, Eastern Orthodoxy emerges as the denomination whose beliefs arguably best match reality. It preserves ancient Christian teachings, emphasizes historical continuity, prioritizes the creeds established early in Christian history, balances scripture and tradition authentically, and avoids later doctrinal innovations (papal infallibility, strict predestination, literalist Sabbatarianism) found in other traditions.

However, the ultimate judgment would depend heavily upon the criteria of evaluation prioritized (apostolic continuity, scriptural primacy, experiential spirituality, or doctrinal coherence).

In summary:

Commonalities: Trinity, Christology, resurrection, Bible’s authority, salvation by grace, afterlife.

Differences: Authority structures, sacraments/ordinances, salvation nuances, eschatology, unique doctrines (predestination, Sabbath, spiritual gifts, saints).

Best Match (assuming Christianity true): Eastern Orthodoxy, due to its historical continuity, balanced theology, fidelity to early church tradition and scripture, and minimal doctrinal innovations.

Expand full comment
Jack Maier's avatar

By the way, I think your approach is great! I think the biggest problem today is that people do not seriously engage the deep questions of reality, and this leads them to not find God. I think the more people examine and think deeply about the questions you are posing to AI, the more will find the truth and eventually come to know peace in relationship with the Holy Trinity. Things are not true because a pastor says them, a pastor says things because they are true. Thank you for what you are doing and I will keep you in my prayers.

On a separate note, I tried finding out if other people had questioned AI on religion and gotten different answers from it and I saw some instances of Buddhism and Islam. I wonder if there is a way to initialize several AIs to have different worldviews and then put them up against one another. One could envision a neutral AI, aimed at finding the truth and emphasizing things such as internal consistency, history, what is the most rational choice given the evidence, etc. that two of the other AIs would try to persuade. I really think that if this could be set up and done earnestly, there would be more direct comparison and a more clear direct answer from the AI. I am pretty busy, but if I can find time, I may try to set this up using the APIs and if I do, I will let you know!

Expand full comment
Growing Through God’s Word's avatar

I find these fascinating.

Expand full comment
Karen Anderson's avatar

Thank you for this AI deep-dive into the validity of the gospels' authors. It would be difficult for a sceptic to argue the facts presented.

Expand full comment
Jack Maier's avatar

By the way, I think your approach is great! I think the biggest problem today is that people do not seriously engage the deep questions of reality, and this leads them to not find God. I think the more people examine and think deeply about the questions you are posing to AI, the more will find the truth and eventually come to know peace in relationship with the Holy Trinity. Things are not true because a pastor says them, a pastor says things because they are true. Thank you for what you are doing and I will keep you in my prayers.

On a separate note, I tried finding out if other people had questioned AI on religion and gotten different answers from it and I saw some instances of Buddhism and Islam. I wonder if there is a way to initialize several AIs to have different worldviews and then put them up against one another. One could envision a neutral AI, aimed at finding the truth and emphasizing things such as internal consistency, history, what is the most rational choice given the evidence, etc. that two of the other AIs would try to persuade. I really think that if this could be set up and done earnestly, there would be more direct comparison and a more clear direct answer from the AI. I am pretty busy, but if I can find time, I may try to set this up using the APIs and if I do, I will let you know!

Expand full comment
Coury  Koutz's avatar

Maybe another one could be asking it to compare and evaluate the evidence for and against the traditional (i.e., Mosaic) authorship of the Torah. Portions of the prompt relating to manuscripts with/without names wouldn’t be applicable, as none of the five books have titles mentioning Moses’s name in either Hebrew or Greek.

Expand full comment