Classical Presupposition Audit — Alvin Plantinga
Classical Presupposition Audit — Alvin Plantinga
Instrument: Classical Presupposition Audit (CPA) v1.0. Instrument architecture and analysis: Dave Kelly. Theoretical foundations: Grant C. Sterling. Prose rendering: Claude. Sterling/Kelly corpus. Philosophy/Epistemology/Theology cluster. 2026.
Subject: Alvin Plantinga (1932–2024), John A. O’Brien Professor of Philosophy, University of Notre Dame (emeritus). Primary sources: God and Other Minds (1967); The Nature of Necessity (1974); God, Freedom, and Evil (1974); Warrant: The Current Debate (1993); Warrant and Proper Function (1993); Warranted Christian Belief (2000); Where the Conflict Really Lies: Science, Religion, and Naturalism (2011).
Prior corpus reference. Named in the CRI (Document 42) as one of the most fully aligned contemporary philosophers in the Aligned Figure Register. No completed CPA existed in the corpus prior to this run.
Step 0 — Protocol Activation
Corpus in view. Sources restricted to Plantinga’s own argumentative record. No prior conclusion stated. Subject is a professional philosopher; the political application constraint does not apply.
Self-Audit Complete. Proceed to Step 1.
Step 1 — Presupposition Profile
C1 — Substance Dualism. Plantinga’s entire philosophical program presupposes a robust distinction between mind and matter. His account of warrant and proper function treats mental states — beliefs, propositional attitudes, cognitive faculties — as entities with normative properties (truth-aptness, proper function, reliability) that cannot be reduced to physical states described in purely naturalistic terms. His Evolutionary Argument Against Naturalism (EAAN) argues explicitly that if naturalism is true — if mental states are nothing more than physical states shaped by evolutionary selection for fitness rather than truth — then we have a defeater for all our beliefs, including naturalism itself. This argument requires that beliefs are genuine truth-apt representational states that are either tracking reality or not, and that this normative property is not reducible to physical causation. His defense of libertarian free will in the free will defense further presupposes that persons are genuine agents whose choices are not determined by prior physical states. His modal epistemology treats modal knowledge — knowledge of necessity and possibility — as a genuine rational faculty distinct from empirical sense perception.
C2 — Libertarian Free Will. Plantinga’s free will defense against the logical problem of evil is the most carefully argued libertarian free will position in analytic philosophy of religion. The defense requires that free will is incompatibilist: God could not have created free creatures who always freely choose rightly, because genuine freedom requires that the choice not be determined by prior causes including divine creation. Plantinga distinguishes transworld depravity from determinism, and the entire architecture of the defense requires that freedom is libertarian. His commitment to libertarian free will is not peripheral but load-bearing for his most prominent argument.
C3 — Ethical Intuitionism. Plantinga does not develop a systematic metaethics, but his argumentative record presupposes moral realism and treats moral knowledge as direct rather than empirically derived. His use of moral intuitions in philosophical argument — the evil of gratuitous suffering as a datum in discussions of theodicy, the wrongness of certain hypothetical choices — treats these intuitions as genuine cognitions of moral reality rather than mere psychological reactions. His proper functionalism provides an epistemological framework within which moral intuitions could be treated as outputs of a properly functioning faculty aimed at moral truth, which is structurally aligned with intuitionism. However, Plantinga does not develop a systematic intuitionist metaethics and does not explicitly defend the direct-apprehension claim against the evolutionary debunking challenge.
C4 — Foundationalism. Plantinga’s reformed epistemology is explicitly foundationalist. His central epistemological project in the Warrant trilogy is the defense of the claim that certain beliefs — including belief in God — can be properly basic: warranted without being inferred from other beliefs. His account of basicality requires a foundationalist structure: some beliefs are foundational (basic), others are non-basic and derive warrant from the basic beliefs supporting them. His critique of classical foundationalism is not a rejection of foundationalism but a revision of which beliefs qualify as basic — extending basicality beyond self-evident, incorrigible, or evident-to-the-senses propositions to include beliefs produced by properly functioning cognitive faculties aimed at truth.
C5 — Correspondence Theory of Truth. Plantinga’s entire philosophical program presupposes correspondence truth. His EAAN is built on the premise that beliefs either track truth — correspond to how things actually are — or they do not, and that natural selection selects for fitness rather than truth, generating a defeater for naturalistic belief-forming processes. This argument has no force unless truth is correspondence to mind-independent reality rather than pragmatic success or coherence. His modal realism about possible worlds treats necessity and possibility as features of reality that modal claims either correspond to or fail to correspond to. His account of warrant as proper function aimed at truth presupposes that truth is the target — the thing the faculty is aimed at — and that target is correspondence with reality.
C6 — Moral Realism. Plantinga’s argumentative record presupposes moral realism at several load-bearing points. His free will defense requires that gratuitous evil is genuinely evil — not merely dispreferred or culturally condemned — and that God’s permitting it requires justification against an objective moral standard. His arguments about the EAAN treat moral knowledge as genuine knowledge of moral reality, not merely of moral attitudes. His claim in Where the Conflict Really Lies that naturalism is in conflict with science because it undermines the reliability of our cognitive faculties extends implicitly to moral cognition: if naturalism produces a defeater for beliefs generally, it produces a defeater for moral beliefs specifically, and Plantinga treats moral beliefs as genuine beliefs rather than mere attitudes.
Self-Audit — Step 1: All six commitment domains present in Plantinga’s record; each presupposition traced to load-bearing argumentative moves; charity requirement applied throughout; no presuppositions inferred from ideological association alone.
Self-Audit Complete. Proceed to Step 2.
Step 2 — Commitment Audit
C1 — Substance Dualism. Aligned. Plantinga’s account of mind, belief, warrant, and proper function presupposes a genuine distinction between mental states and physical states that cannot be collapsed into naturalism. His EAAN makes this presupposition load-bearing: the argument fails if mental states are nothing but physical states shaped by evolutionary processes for fitness rather than truth. No contrary presupposition in his record qualifies this finding.
C2 — Libertarian Free Will. Aligned. The free will defense requires incompatibilist libertarian free will as a structural premise. Compatibilist freedom would not serve the argument, as Plantinga explicitly acknowledges: God could have determined free creatures to always choose rightly if freedom were merely compatibilist. The libertarian commitment is not peripheral; it is load-bearing for the argument’s central claim.
C3 — Ethical Intuitionism. Partially Aligned. Plantinga’s record treats moral intuitions as genuine cognitions of moral reality and his proper functionalism provides the epistemological architecture within which direct moral apprehension is possible: properly basic beliefs, warrant as proper function, the sensus divinitatis as a cognitive faculty aimed at truth. The residual is that Plantinga does not develop a systematic intuitionist metaethics and does not explicitly defend the direct-apprehension claim against the standard objections, particularly the evolutionary debunking challenge. The alignment is structural and implicit rather than argued and explicit. This is the profile’s sole qualification: the architecture is present; the explicit argumentative defense of direct moral apprehension specifically is not.
C4 — Foundationalism. Aligned. Reformed epistemology is an explicitly foundationalist program. The properly basic belief architecture is foundationalism with a revised criterion of basicality. Plantinga’s critique of classical foundationalism is internal to foundationalism rather than a rejection of it: he argues that the classical criterion of basicality is too restrictive and self-defeating (it is not itself self-evident, incorrigible, or evident to the senses), not that foundationalism as a structure is wrong. The revised foundationalism — properly basic beliefs grounded in warrant as proper function aimed at truth — is the most technically developed foundationalist epistemology in the corpus.
C5 — Correspondence Theory of Truth. Aligned. The EAAN requires correspondence truth as a structural premise: beliefs either track truth (correspondence to reality) or they track fitness (correlation with adaptive behavior), and natural selection selects for the latter rather than the former. The argument that this produces a defeater for naturalism presupposes that truth is the target rational faculties should be aimed at, and that truth is correspondence to mind-independent reality rather than pragmatic success or coherence. No deflationary or pragmatist qualification of correspondence truth appears in his record as load-bearing.
C6 — Moral Realism. Aligned. Plantinga’s free will defense requires objective moral facts — the genuine evil of gratuitous suffering — as a load-bearing premise. His treatment of moral knowledge as genuine knowledge rather than mere attitude is consistent across his record. His extension of the EAAN to the moral domain treats moral beliefs as subject to the same epistemic standards as any other beliefs, which presupposes that they have the same truth-aptness — that they either correspond to moral reality or fail to.
Self-Audit — Step 2: All six commitments audited without selective treatment; Non-Operative not used to avoid any finding; findings follow analysis; no findings issued outside corpus domain; Inconsistent findings: none required.
Self-Audit Complete. Proceed to Step 3.
Step 3 — Dissolution Finding
C1: Aligned. C2: Aligned. Neither is Contrary. Per the dissolution rule: No Dissolution.
Plantinga’s framework does not require those who adopt it to dissolve their prohairesis into an external system. His substance dualism preserves the ontological reality of the rational faculty as genuinely distinct from physical determination. His libertarian free will preserves genuine originating agency. An agent who adopts Plantinga’s framework retains a self-description in which the rational faculty is real, causally efficacious, and the genuine source of its own assents.
Self-Audit Complete. Proceed to Step 4.
Step 4 — Summary Finding
Part A — Commitment Pattern
| Commitment | Finding |
|---|---|
| C1 — Substance Dualism | Aligned |
| C2 — Libertarian Free Will | Aligned |
| C3 — Ethical Intuitionism | Partially Aligned |
| C4 — Foundationalism | Aligned |
| C5 — Correspondence Theory of Truth | Aligned |
| C6 — Moral Realism | Aligned |
Five Aligned (C1, C2, C4, C5, C6), one Partially Aligned (C3), zero Contrary, zero Inconsistent, zero Non-Operative. No Dissolution. The profile’s deepest point of divergence is C3: the structural alignment is present (proper functionalism provides the architecture for direct moral apprehension) but the explicit argumentative defense of that direct-apprehension capacity against the evolutionary debunking challenge is not developed. The strongest alignments are C2 and C4, where the commitments are not merely presupposed but explicitly argued with sustained rigor across dedicated works. The profile places Plantinga as the second fully or near-fully clean profile in the Theology/Philosophy cluster series, after Swinburne (6 Aligned). Both are achieved through routes entirely distinct from the Thomist cluster’s hylomorphic architecture and from Huemer’s phenomenological intuitionism, constituting independent derivations of the same commitment set.
Part B — Dissolution Finding. No Dissolution. C1 Aligned, C2 Aligned. Plantinga’s framework preserves both the ontological priority of the rational faculty and genuine originating agency.
Part C — Agent-Level Implication. An agent who adopts Plantinga’s framework acquires: the ontological reality of the rational faculty as genuinely distinct from physical-natural determination (C1); genuine originating agency grounded in the most carefully argued libertarian free will position in analytic philosophy of religion (C2); the epistemological architecture for direct moral apprehension without its explicit defense against the debunking challenge (C3, partially); the most technically developed foundationalist epistemology in the corpus, with properly basic beliefs grounded in warrant as proper function aimed at truth (C4); correspondence truth as the governing standard throughout the EAAN and the warrant trilogy (C5); and moral realism grounded in the objective evil that theodicy must account for (C6). The one architecturally incomplete element — C3’s lack of explicit defense against the evolutionary debunking challenge — is bridgeable: the proper functionalism framework aimed at moral truth is the structural precondition for intuitionism; the explicit defense remains philosophical work the agent can supply from within the framework Plantinga provides.
Corpus boundary. The CPA issues findings on presuppositions embedded in an argumentative record. It does not evaluate the truth of Plantinga’s arguments, the adequacy of his theodicy, or his standing within analytic philosophy of religion.
Self-Audit Complete: summary follows from preceding steps without new material introduced; agent-level implication stated without conversion to political verdict; corpus boundary declared. CPA run complete.
Theoretical foundations: Grant C. Sterling. Instrument architecture and analysis: Dave Kelly. Prose rendering: Claude.
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