The Principle
Religious liberty - the right of individuals to hold, express, and practice their religious beliefs without government compulsion or interference - is among the most paradoxically biblical of constitutional principles. Paradoxically, because the Bible's most dramatic legal legacy here was produced by people arguing from Scripture that the state has no authority over Scripture. Roger Williams, the founder of the first polity in history to guarantee complete religious liberty, derived his argument not from secular skepticism but from a theological reading of the parable of the wheat and tares. The First Amendment's Establishment and Free Exercise Clauses are the constitutional descendants of a profoundly biblical argument about the limits of government over the soul.
Biblical Foundation
Matthew 13:24-30 contains the parable of the wheat and tares: "The kingdom of heaven is likened unto a man which sowed good seed in his field: But while men slept, his enemy came and sowed tares among the wheat, and went his way... The servants said unto him, Wilt thou then that we go and gather them up? But he said, Nay; lest while ye gather up the tares, ye root up also the wheat with them. Let both grow together until the harvest."
Matthew 13:29 was Roger Williams's proof text: "Nay; lest while ye gather up the tares, ye root up also the wheat with them." The master forbids the servants from attempting to separate the righteous from the unrighteous in the present age, on the ground that human judgment will inevitably produce errors that destroy the righteous. Williams's argument: civil magistrates who attempt to enforce religious conformity inevitably persecute genuine believers along with heretics, because they lack the divine omniscience needed to distinguish true faith from false.
John 18:36 records Jesus's statement before Pilate: "My kingdom is not of this world: if my kingdom were of this world, then would my servants fight, that I should not be delivered to the Jews: but now is my kingdom not from hence." Williams cited this to argue that the Messiah himself declined to deploy civil power in service of his kingdom - a precedent that permanently disqualified the state from serving as an instrument of religious enforcement.
Romans 14:12 - "So then every one of us shall give account of himself to God" - grounded the argument in individual moral accountability: since each person answers personally to God for their beliefs, no state authority can intervene in that direct relationship. Conscience is answerable to God alone.
Historical Transmission
The argument for religious toleration has a complex genealogy. Early Christian advocates for toleration under Roman persecution - Tertullian's argument that "it is a fundamental human right, a privilege of nature, that every man should worship according to his own convictions" (Ad Scapulam, c. 211 CE) - were not arguing for a general principle but for exemption from state religion. After Constantine, and particularly after Theodosius made Christianity the state religion (380 CE), the Christian church became the enforcer of religious conformity, and this situation persisted throughout the medieval period.
The Protestant Reformation created a new crisis: religious pluralism within Christianity made state enforcement of orthodoxy simultaneously more brutal and more obviously problematic. Sebastian Castellio's response to Calvin's burning of Servetus - "If you could kill a man, Castellio, what would you do? I would let him live" - and his De Haereticis (1554) were early Protestant arguments for toleration, though still limited.
Roger Williams's The Bloudy Tenent of Persecution (1644) was the breakthrough text. Williams argued from Scripture that persecution for religious reasons was fundamentally anti-biblical: it violated the parable of the wheat and tares, it misread the Old Testament theocracy's civil-religious unity as normative for all ages, and it wrongly assumed that civil magistrates had the competence to judge spiritual matters. His Rhode Island charter of 1663 - guaranteeing that no person "shall be in any wise molested, punished, disquieted, or called in question, for any differences in opinion in matters of religion" - was the first modern constitutional guarantee of religious freedom.
John Milton's Areopagitica (1644) and his Of Civil Power in Ecclesiastical Causes (1659) developed related arguments, as did John Locke's Letter Concerning Toleration (1689), which provided the philosophical framework Madison and Jefferson drew on directly. Locke's argument was ultimately theological: the church's proper weapons are spiritual, not civil, and the state cannot compel sincere belief even if it can compel external compliance.
James Madison's Memorial and Remonstrance Against Religious Assessments (1785) - written to oppose Patrick Henry's bill funding Christian teachers in Virginia - drew directly on Williams's and Locke's arguments. Madison argued that religion is beyond the jurisdiction of society ("the duty which we owe to our Creator") and that establishment corrupts religion as much as liberty. The First Amendment's religion clauses followed directly from this argument.
Key Champions
Roger Williams (1603-1683) is the founding figure, whose Rhode Island experiment demonstrated that a polity could function without an established church. Williams was more theologically rigorous than most of his contemporaries; his argument for religious liberty was not a retreat from Christianity but a deeper reading of it. John Leland (1754-1841), a Baptist minister who personally lobbied Madison and Jefferson for First Amendment religion clauses, represents the evangelical tradition's contribution. The Baptists were the most consistent advocates for religious liberty in colonial America precisely because, as a minority, they had the most to gain from it - but their arguments were consistently theological rather than merely self-interested.
Modern Application
In Everson v. Board of Education (1947), the Supreme Court incorporated the First Amendment's Establishment Clause against the states and articulated the "wall of separation" metaphor drawn from Jefferson's letter to the Danbury Baptist Association (1802), which was itself drawing on Williams's formulation. The metaphor is contested: Originalist scholars like Michael McConnell argue that it misrepresents the Framers' intent, which was to prohibit a national church rather than to require strict church-state separation in all public life.
In Employment Division v. Smith (1990), the Court held that religiously neutral laws of general applicability need not provide religious exemptions - a ruling that dramatically narrowed Free Exercise protection and led to the Religious Freedom Restoration Act (RFRA, 1993) and state equivalents. The RFRA debate was explicitly theological: its supporters argued that the Smith ruling violated the biblical principle that conscience is accountable to God rather than the state. Masterpiece Cakeshop v. Colorado Civil Rights Commission (2018) and 303 Creative v. Elenis (2023) represent the current frontier of religious liberty litigation, turning on how to balance biblical conscience claims against anti-discrimination laws.
Scholarly Debate
The historiography of religious liberty's origins is contested. Mark DeWolfe Howe in The Garden and the Wilderness (1965) argued that Williams's theological argument, not Locke's political philosophy, was the primary source of First Amendment religion law. Frank Lambert's The Founding Fathers and the Place of Religion in America (2003) argues for a more secular Enlightenment narrative. John Fea's Was America Founded as a Christian Nation? (2011) mediates the debate, showing that both theological and secular traditions contributed. The consensus emerging from recent scholarship acknowledges that Williams's biblical argument was decisive for the polity-level innovation - Rhode Island - that demonstrated religious liberty was practically possible.
Comparative Perspective
Islamic jurisprudence's famous principle "there is no compulsion in religion" (Surah Al-Baqarah 2:256) - one of the Qur'an's clearest statements - has been interpreted both expansively (as a general principle of religious liberty) and narrowly (as limited to initial conversion). The history of dhimmi status in Islamic states - protected but subordinate status for Christians and Jews - reflects a parallel tension between a founding principle of non-compulsion and the practical requirements of a state religion. Jewish experience of forced conversion and persecution generated the most urgent advocacy for religious liberty in early modern Europe; many of the Enlightenment's arguments for toleration were formed in response to anti-Jewish discrimination and were sometimes made by Jewish intellectuals.