The problem of sectarianism

The problem of sectarianism refers to the epistemological challenge posed by the fragmentation of Christianity into a vast and still-growing number of mutually incompatible denominations. The third edition of the World Christian Encyclopedia, published in 2020, identifies over 45,000 distinct Christian denominations worldwide, a figure that grows every year as new groups form through schism, theological dispute, or independent founding.¹ The challenge is not merely sociological but philosophical: Christianity holds that the Holy Spirit guides sincere believers into all truth, that the Bible is the inspired word of God, and that the church is the Body of Christ speaking with a coherent voice. The existence of tens of thousands of contradictory voices, each appealing to the same Spirit and the same scripture, demands an explanation that standard Christian theology struggles to supply.

The argument from sectarianism is a focused version of the argument from religious diversity turned on a single tradition from the inside. Where the broader argument notes that Hinduism, Islam, Judaism, and Christianity cannot all be correct, the problem of sectarianism notes that Methodist, Baptist, Catholic, Eastern Orthodox, Pentecostal, Reformed, and Jehovah’s Witness Christianity cannot all be correct, and asks why an omniscient, truth-guiding Spirit would produce such contradictory outcomes among equally sincere and prayerful readers of the same text.¹⁰

The scale of fragmentation

The figure of 45,000 denominations requires some qualification. The World Christian Encyclopedia counts any organizationally distinct body with a distinguishable doctrine, polity, or practice as a separate denomination. Critics note that this classification includes many small independent congregations and house churches that share broad theological agreement with larger bodies. Even on more conservative counts, however, the number of doctrinally distinct Christian groupings runs into the thousands. The World Council of Churches has member churches representing hundreds of distinct confessional traditions. The Barrett–Johnson methodology that produced the 45,000 figure has been widely cited in the sociological literature on Christianity and, whatever its methodological limitations, points unambiguously to a phenomenon of extraordinary organizational and doctrinal proliferation.^{1, 6}

The rate of growth is itself significant. In 1900, the same survey methodology identified approximately 1,900 Christian denominations. By 1980, the figure had risen to roughly 20,000. By 2020, it had more than doubled again.¹ This is not a pattern of convergence toward doctrinal unity — it is a pattern of accelerating divergence. New denominations do not typically represent refinements of earlier theological consensus; they represent new points of rupture. The trajectory is the opposite of what one would expect if a divine Spirit were progressively guiding the global church toward unified understanding of the truth.

Major schisms in historical context

The history of Christianity is in large part a history of schism. The first major permanent rupture occurred in 1054, when the Christian church divided into the Roman Catholic and Eastern Orthodox traditions in what historians call the Great Schism. The precipitating disputes involved the filioque clause — whether the Holy Spirit proceeds from the Father alone or from the Father and the Son — as well as questions of papal authority and jurisdiction. Both sides claimed the guidance of the Holy Spirit and the authority of the apostolic tradition. Both sides produced councils, patriarchs, and theologians of comparable learning and piety who arrived at irreconcilable conclusions.^{4, 3}

The Protestant Reformation, initiated by Martin Luther’s 95 Theses in 1517, produced a second and far more far-reaching fragmentation. Luther challenged the doctrinal and institutional authority of Rome on justification, scripture, purgatory, and the sacraments. What began as a reform movement rapidly produced multiple competing streams: Lutheranism, Calvinism, Zwinglianism, Anglicanism, and the Radical Reformation (Anabaptists, Mennonites, Hutterites), each with its own account of scripture, sacrament, ecclesiology, and salvation. The reformers did not agree among themselves. Luther and Zwingli famously broke over the interpretation of the Eucharist at the Marburg Colloquy of 1529, each citing scripture and the Spirit in support of mutually exclusive positions.^{5, 17}

Post-Reformation fragmentation accelerated rather than slowed. The seventeenth century produced Baptists, Quakers, and Congregationalists; the eighteenth produced Methodism; the nineteenth produced Adventism, the Restoration Movement (Churches of Christ, Disciples of Christ), and the Holiness movement; the twentieth produced Pentecostalism, the Charismatic movement, the Word of Faith movement, and thousands of independent fundamentalist and evangelical denominations. Each of these movements emerged from sincere theological conviction, each claimed scriptural warrant, and each contributed to a body of Christian teaching that is internally contradictory on questions ranging from baptism to eschatology to the gifts of the Holy Spirit.^{3, 15}

The epistemological problem

The theological claim that generates the epistemological problem is explicit in Christian doctrine. The Gospel of John records Jesus promising that the Spirit of truth “will guide you into all truth” (John 16:13, NRSV). The First Epistle of John states that the anointing believers receive from the Holy Spirit “teaches you about all things” (1 John 2:27, NRSV). Paul writes that “those who are led by the Spirit of God are the children of God” (Romans 8:14, NRSV). These are not peripheral proof-texts; they are central to the Christian account of how believers come to know theological truth. The argument from sectarianism holds that this claim generates a specific empirical prediction: if the Spirit reliably guides sincere believers into truth, then sincere believers guided by the Spirit should converge on truth, at least on the doctrines most critical to salvation and Christian living.

The prediction fails. Sincere, Spirit-claiming, Bible-reading Christians disagree on whether salvation requires faith alone or faith and works; on whether baptism should be administered to infants or only to professing believers; on whether baptism requires full immersion; on whether the Eucharist involves the real presence of Christ, a spiritual presence, or a mere memorial; on whether God has predestined individuals to salvation or damnation; on whether divine grace is irresistible; on whether miraculous gifts such as tongues and healing continue today; on whether women may hold ordained church office; on whether homosexual unions may be blessed; on whether the earth is approximately 6,000 years old; and on what will happen at the end of history.^{1, 3, 11} These are not marginal disagreements between eccentric individuals. They are the defining doctrines of major, mainstream Christian traditions, each with millions of adherents, each claiming the guidance of the same Spirit.

The formal structure of the problem can be stated as follows:

P1. Christian theology holds that the Holy Spirit guides sincere believers who study scripture into truth on matters of doctrine.

P2. There exist many millions of sincere, prayerful, scripture-reading Christians who, appealing to the Spirit’s guidance, arrive at mutually contradictory doctrinal conclusions.

P3. Mutually contradictory conclusions cannot all be true.

C1. Therefore, the Holy Spirit is either not guiding all of these believers, is guiding them poorly, or the theological claim in P1 is false or significantly overstated.

C2. In any case, the claim that Spirit-guided scripture study reliably produces true belief is undermined by the evidence.

Alvin Plantinga has argued that the mere existence of disagreement does not defeat the warrant of a belief, since epistemic disagreement is ubiquitous in philosophy, science, and ethics, and requiring conciliation in all cases of peer disagreement would generate a global scepticism no one accepts.⁹ The problem of sectarianism, however, differs from ordinary peer disagreement in a specific way: the disagreeing parties all invoke the same supernatural mechanism — Spirit guidance — as their source of epistemic warrant. If a Calvinist and an Arminian both claim that the Spirit has guided them to their respective positions, and those positions contradict one another, then either one party is wrong about having been guided, or the Spirit is guiding people to contradictory conclusions, or the mechanism of Spirit guidance is not functioning as advertised. None of these options is comfortable for standard Christian epistemology.¹³

The sociological explanation

Outside Christian apologetics, the formation of denominations is well understood as a social process. Peter Berger’s analysis of religious plausibility structures demonstrates that what a community treats as theologically obvious is determined far more by social setting than by independent exegetical inquiry.⁶ Denominational formation tracks sociological fault lines with a regularity that is difficult to explain if theology is driven by Spirit-guided truth-seeking.

The American case is particularly well documented. The major denominational splits of the nineteenth century divided along racial and sectional lines that preceded and survived the Civil War. The Southern Baptist Convention was founded in 1845 explicitly to defend the compatibility of Christianity and slaveholding, after Northern Baptists refused to appoint slaveholders as missionaries. The Methodist Episcopal Church, South, separated from its Northern counterpart over the same issue. The Presbyterian Church divided North and South, again over slavery. In each case, the division was not triggered by Spirit-guided insight into a doctrinal question that had previously been unresolved; it was triggered by political and economic interests that were then given theological justification.^{8, 7}

Roger Finke and Rodney Stark’s sociological work on American religious history demonstrates that denominational growth and decline follow patterns of market competition for adherents, not patterns of theological discovery. Denominations that succeed are those that lower barriers to entry, provide tight community bonds, and adapt their message to the emotional and cultural needs of their target population. Theological distinctives function primarily as brand differentiation, not as truth claims refined by the Spirit’s guidance.⁷ This is not an argument that theology is never sincerely held — it plainly is — but it is an argument that the forces shaping which theology a community adopts are predominantly sociological rather than epistemic.

Michael Emerson and Christian Smith’s study of evangelical Christianity in America found that racial segregation in American churches — described by Martin Luther King Jr. as occurring during “the most segregated hour in Christian America” — persists not because of explicit doctrinal disagreement but because of cultural and social network effects that operate beneath the level of conscious theological reflection.⁸ American Christians of different racial backgrounds holding nearly identical formal doctrines worship in almost entirely separate congregations. If Spirit guidance shaped denominational affiliation, one would not expect it to respect the colour line.

The contrast with science

A natural comparison illuminates the problem. Scientific disagreements are also real, persistent, and sometimes acrimonious. Thomas Kuhn documented the sociology of paradigm conflict and the resistance of established scientific communities to revolutionary new frameworks.¹² Science is not a frictionless mechanism for producing consensus. Nevertheless, scientific disagreements have a characteristic resolution pattern: they are resolved by evidence. The heliocentric model eventually displaced the geocentric model. Continental drift became the consensus position when magnetostratigraphic evidence accumulated in the 1960s. The age of the universe converged on 13.8 billion years as multiple independent lines of evidence pointed to the same figure. Competing hypotheses in science are characteristically rejected, modified, or absorbed into broader frameworks when evidence bears against them.

Theological disagreements within Christianity do not follow this pattern. The dispute over whether baptism requires full immersion or whether sprinkling is acceptable has been ongoing for five centuries. It has not been resolved by new evidence, new argument, or convergent Spirit guidance. It has simply persisted, generating separate denominations (Baptist, Presbyterian, Lutheran, Anglican, Orthodox) that have learned to coexist with permanent disagreement. The dispute over predestination and free will has been contested since at least the fifth century, when Augustine argued with Pelagius, and the Reformation debates between Calvinists and Arminians in the sixteenth and seventeenth centuries refined the positions without resolving them. These are not open questions awaiting additional evidence; they are questions on which the available evidence — scripture, tradition, reason, and claimed Spirit guidance — has been exhaustively marshalled on all sides without convergence.^{17, 3}

This contrast poses a specific challenge to the claim that the Holy Spirit functions as a truth-guiding mechanism. If the Spirit guides believers into truth, theological inquiry should show progressive convergence over time, as the Spirit-guided community increasingly agrees on contested questions. The historical record shows the opposite: progressive divergence, with new disagreements perpetually generated faster than old ones are resolved.

The “one true church” response

The most direct theological response to the problem of sectarianism is the “one true church” claim: only one denomination correctly preserves the apostolic teaching, and the proliferation of false traditions is unsurprising given human sin and error. Roman Catholicism, Eastern Orthodoxy, and various smaller bodies (including the Churches of Christ and some Restorationist groups) each advance versions of this claim. If it is correct, then denominational diversity does not embarrass the Spirit-guided church; it embarrasses the schismatics who departed from it.

The problem is that every major tradition makes precisely this claim, and each bases it on the same types of evidence: continuity with the apostles, fidelity to scripture, doctrinal coherence, the fruits of holiness in its members, and the testimony of the Spirit. The Roman Catholic Church points to the continuous line of papal succession from Peter; the Eastern Orthodox Church disputes this reading of early church history and points to the seven Ecumenical Councils as the authoritative standard; the Churches of Christ claim that all of these traditions have departed from the simple pattern of the New Testament church and that their own practice restores it; Pentecostals claim that the restoration of miraculous spiritual gifts in the twentieth century confirms that the Spirit is working through their movement in a way not seen in more ancient institutions. Each tradition’s argument for its own authenticity is structurally identical to every other tradition’s argument, yet they cannot all be correct.^{3, 16}

C. S. Lewis, writing in Mere Christianity, attempted to identify a core of “mere Christianity” on which all traditions agreed, treating denominational differences as matters of legitimate secondary variation.¹⁶ This move is rhetorically effective but epistemologically inadequate. The doctrines on which Christians disagree — the nature of salvation, the meaning of the sacraments, the authority of the church, the role of works in justification — are not peripheral liturgical preferences; they are claims about how one is reconciled to God, what the church is, and what it means to be saved. Treating them as secondary is itself a contested theological position not shared by the traditions that take them to be fundamental.

Relationship to the argument from religious diversity

The argument from religious diversity holds that the existence of many incompatible religious traditions — Christianity, Islam, Hinduism, Buddhism, and so on — undermines the epistemic justification of any one tradition’s distinctive claims, since sincere, intelligent, and devout people across cultures have arrived at irreconcilably different conclusions about ultimate reality. The problem of sectarianism is a stronger version of this argument applied within a single tradition.

The standard Christian response to the argument from religious diversity is that the other traditions are simply mistaken — they lack the Spirit’s guidance, or they have suppressed the truth in unrighteousness, or they are following distorted traditions. This response, whatever its merits, is not available when the same diversity appears within Christianity itself. A Christian cannot explain why Catholic and Baptist Spirit-guided readers of the same Bible reach opposite conclusions about baptism by appealing to the spiritual blindness or cultural distortion of one party, without that explanation applying equally to many sincere and learned Christians on both sides.^{10, 14}

The problem of sectarianism also reinforces the argument from inconsistent revelations. That argument holds that the diversity of claimed divine revelations across religions undermines the evidential force of any single revelation claim. The sectarianism problem adds that even within a single claimed revelation — the Christian scriptures — the hermeneutical diversity is so extreme that the text cannot function as the reliable guide to truth it is claimed to be. If the same text, read under the promised guidance of the same Spirit, yields Baptist, Catholic, Reformed, Pentecostal, and Jehovah’s Witness theology, the text and the Spirit together are not providing the epistemic grounding that Christian theology requires them to provide.¹⁰

Assessment

The problem of sectarianism is not a knock-down refutation of Christian belief. It is possible to respond that the Spirit guides individuals rather than institutions, that doctrinal matters vary in their centrality and only the most central are reliably communicated, or that the eschatological unity of the church is a future reality rather than a present one. Plantinga’s reformed epistemology holds that a believer can be warranted in their specific tradition’s beliefs even in the face of widespread disagreement, if those beliefs are produced by a properly functioning cognitive faculty responding to genuine divine reality.⁹

What the problem does establish is that the Spirit-guidance account of Christian epistemology, taken at face value, generates empirical predictions that the historical and sociological record fails to support. The trajectory is one of divergence, not convergence; the determinants of denominational affiliation are sociological, not theological; and the doctrines on which Christians persistently disagree are precisely the doctrines on which the Spirit’s guidance was most explicitly promised. A theological epistemology that cannot explain why its primary truth-guiding mechanism produces contradictory outputs in sincere and devout practitioners is an epistemology under genuine stress, and the scale of Christian sectarianism ensures that this stress cannot be explained away as a peripheral anomaly.^{1, 6, 13}