Alvin Plantinga's Model proposes that belief in God can be warranted without requiring evidence or argument, grounded instead in a properly functioning cognitive faculty (sensus divinitatis) that produces theistic belief in appropriate circumstances. The model distinguishes between de jure and de facto objections to theistic belief, arguing that the rationality of belief in God depends on whether God actually exists. If God exists and has endowed humans with reliable belief-forming mechanisms oriented toward producing true beliefs about the divine, then theistic belief formed through these mechanisms possesses warrant—that property which distinguishes knowledge from mere true belief. The model thus shifts the epistemological question from whether theistic belief requires evidence to whether humans possess cognitive faculties designed to produce true beliefs about God.
Plantinga developed this model primarily in his trilogy on warrant: Warrant: The Current Debate (1993), Warrant and Proper Function (1993), and Warranted Christian Belief (2000). Building on earlier reformed epistemologists like Abraham Kuyper and Herman Bavinck, Plantinga draws particularly on John Calvin's notion of the sensus divinitatis—an innate human capacity to perceive God's existence. Key defenders include Nicholas Wolterstorff in Reason within the Bounds of Religion (1976), William Alston in Perceiving God (1991), and Michael Bergmann in Justification without Awareness (2006). Contemporary proponents like Tyler McNabb and Erik Baldwin have extended the model to address religious diversity, while Andrew Moon and Matthew Benton have refined its application to religious epistemology more broadly.
Critics argue that Plantinga's model suffers from epistemic circularity: it assumes God's existence to establish the warrant for believing in God's existence. Richard Feldman and Philip Quinn contend that even if theistic belief can be properly basic, reflective individuals aware of religious disagreement acquire defeaters requiring evidential support. The Great Pumpkin objection, pressed by Michael Martin and Keith Parsons, suggests the model proves too much—any belief system could claim similar warrant by positing appropriate cognitive faculties. Defenders respond that the model doesn't aim to convince non-theists but rather shows that theistic belief violates no epistemic duties if true. They argue the circularity is benign, comparable to using perception to validate perceptual reliability, and that not all belief systems can plausibly claim the same historical, phenomenological, and explanatory resources as theism.
Plantinga's Model differs from other reformed epistemology formulations in its systematic development of warrant theory. While Properly Basic Beliefs focuses on the foundational structure of noetic systems and the parity between belief in God and other basic beliefs, Plantinga's model provides detailed conditions for warrant: proper function, appropriate environment, truth-aimed design plan, and reliability. Unlike Warrant and Proper Function as a general epistemological theory, Plantinga's model specifically addresses religious belief through the sensus divinitatis and the noetic effects of sin. The model also differs from responses to the Great Pumpkin Objection by offering positive reasons why theistic belief satisfies warrant conditions rather than merely defending against parody objections.