Religion and Morality

What is the relation between God and morality? Three questions must be separated: (1) the metaphysical question — does morality depend on God for its existence or authority? (2) the epistemic question — do we need religion to know right from wrong? (3) the motivational question — do we need God to be motivated to be good? The moral argument for God answers (1) "yes" and builds a case for theism on it; this page examines the relation itself, independently of whether it yields an argument. Its centre is the Euthyphro dilemma and Divine Command Theory, and its stakes are whether ethics can stand without God — the question Nietzsche and Dostoevsky made unavoidable.

This page treats the Euthyphro dilemma in full, Divine Command Theory and its modifications, the autonomy objection, natural law theory, and the secular grounding of ethics. It is the conceptual partner of the moral argument (which uses this material to argue for God) and connects to the meaning of life.

The Euthyphro dilemma

The foundational text is Plato's Euthyphro, where Socrates asks whether the holy is holy because the gods love it, or the gods love it because it is holy. Transposed to monotheism and to morality generally:

Is an action morally good because God commands (wills/loves) it, or does God command it because it is good?

Each horn threatens a theistic ethics:

• First horn — good because commanded (theological voluntarism). If actions are good solely in virtue of God's commanding them, then:
  • Arbitrariness. God could have commanded anything — cruelty, betrayal, gratuitous torture — and thereby made it good. Morality rests on sheer divine will, with no reason behind it; "God is good" becomes the empty tautology "God wills what God wills."
  • Vacuous praise. We can no longer praise God for his goodness, since "good" just means "commanded by God" — calling God good says nothing.
  • The "abhorrent commands" problem. It seems possible, on this view, that torturing innocents could have been obligatory — a conclusion most treat as a reductio.
• Second horn — commanded because good (theological intellectualism). If God commands actions because they are already good, then:
  • Independence. The standard of goodness is prior to and independent of God's will; God recognises and conforms to it. Morality does not depend on God after all — defeating the first premise of the moral argument — and an atheist may help herself to the same independent standard.
  • A limit on sovereignty. God is subject to a moral order he did not create, which many theists find incompatible with divine aseity and ultimacy.

The dilemma is genuinely forcing: voluntarism makes morality arbitrary; intellectualism makes it independent of God. A theistic ethics must escape between the horns.

Divine Command Theory

Divine Command Theory (DCT) is the view that moral status is constituted by God's commands — an act is obligatory because God commands it, forbidden because God forbids it, permitted otherwise. It grasps the first horn, embracing voluntarism, and is attractive because it gives moral obligations exactly the features that puzzle the secularist: they are objective (independent of human attitudes), prescriptive (commands intrinsically guide action), and authoritative (issued by a competent authority with standing over us). DCT is the natural ground for the moral argument: if obligation just is divine command, then no God means no obligation.

Modified DCT (Adams)

The decisive contemporary move, Robert Adams's modified divine command theory, escapes the arbitrariness horn by splitting goodness from obligation:

• The good (value) is not commanded into being. It is grounded in God's own nature: God is the supreme Good (the Platonic Form of the Good, relocated into the divine nature), and finite things are good by resembling or participating in God. So goodness is fixed by God's unchanging, essentially loving character, not by arbitrary will.
• Obligation (duty) is grounded in the commands of this essentially loving God. Because the commander is necessarily good and loving, the arbitrariness worry collapses: such a God cannot command gratuitous cruelty, since that would contradict the very nature that constitutes goodness. The "abhorrent command" scenario is impossible, not merely unchosen.

Adams thus claims the dilemma is false: there is a third option — goodness is neither independent of God nor a product of arbitrary will, but identical with God's nature, while obligation flows from the commands of that good nature. This is the mainstream theistic reply, and it depends crucially on divine simplicity / goodness (God is goodness).

The dilemma reasserted

Critics press that modified DCT only relocates the dilemma. Ask of God's nature what was asked of God's will: is God's nature good because it meets some standard of goodness (then that standard is prior to and independent of God — the second horn returns one level up) or is "God's nature is good" stipulative (then the arbitrariness returns — why is this nature, rather than another, the standard?)? The theist answers that God's nature is the paradigm and truthmaker of goodness — not measured against a standard but being the standard — so the demand "why is God's nature good?" is confused, like asking why the standard metre is a metre long. Whether this is a genuine escape or a redefinition that stops inquiry by fiat is the unresolved crux, and it turns on the coherence of grounding value in a being.

The autonomy objection

A distinct, Kantian objection targets DCT (and theistic ethics generally) from the side of moral agency: to do something because God commands it — out of obedience, or fear of hell, or hope of reward — is heteronomous, acting on an external authority, and so (for Kant) not genuinely moral at all. Moral worth requires autonomy: acting from the moral law as one's own rational legislation, for the sake of duty itself, not because one was told. On this view, grounding morality in divine command degrades it into prudence or servility. The theist replies (i) that loving obedience to a perfectly good God is not servile but the appropriate response to recognised goodness (as following a wise teacher is not heteronomous if one grasps the wisdom), and (ii) that on modified DCT one does the good because it is good (grounded in God's nature), and merely has obligations settled by command — so the motive can be the good itself, not bare authority. The objection nonetheless captures a real worry about why-be-moral reducing to reward-and-punishment, which the pragmatic arguments and the hell debate sharpen.

Natural law theory

A different theistic ethics avoids voluntarism entirely. Natural law theory (Aristotle, Aquinas) grounds morality not in commands but in nature and reason: there is an objective human good (flourishing, eudaimonia), discoverable by reason reflecting on human nature and its ends, and the moral law is the set of precepts directing us to that good ("good is to be done and pursued, evil avoided," and the specific goods of life, knowledge, society, etc.). God is the author of the natural order and its ends, so the natural law is ultimately grounded in the divine reason (the eternal law) — but it is known by natural reason without revelation, and binds because it conforms to our nature, not because it is commanded. Natural law thus sits on (or near) the second horn — the good is grounded in nature/reason, which God creates but does not arbitrarily stipulate — and it underwrites the claim that believers and unbelievers alike can know and share a common morality (important for pluralism and public ethics). Its difficulties: deriving determinate norms from "human nature" (the is/ought and the naturalistic-fallacy worries), and the contested content (natural-law arguments about sexuality, etc.).

Can ethics be grounded without God?

The deepest question for the whole topic — and the one that decides the moral argument — is whether objective morality survives the removal of God. Two opposed traditions:

• "If God is dead, everything is permitted." Dostoevsky's Ivan Karamazov, and Nietzsche's announcement of the "death of God," both press that objective morality was always parasitic on the theistic framework; remove God and you remove the ground of binding value, leaving either nihilism or the need to create values (Nietzsche's Übermensch, the "revaluation of all values"). J.L. Mackie gives the analytic version: objective, intrinsically prescriptive values would be metaphysically queer entities, unlike anything in a naturalistic world, so we should be moral error theorists — there are no objective moral facts (the moral argument's conditional accepted, its conclusion reversed: no God, so no real morality).
• Secular ethics can stand alone. The opposing tradition holds that morality needs no theological foundation:
  • Non-natural realism / Platonism (Moore, Parfit, Enoch): moral facts are sui generis, necessary, mind-and-God-independent truths, like mathematical ones.
  • Naturalist realism (Aristotelian natural goodness, Foot, Railton): moral facts are constituted by facts about flourishing and well-being, knowable empirically.
  • Kantian constructivism (Korsgaard, Rawls, Scanlon): objectivity is grounded in the constitutive demands of rational agency or in what no one could reasonably reject — autonomy, not a commander.
  • Contractarianism / evolved cooperation: morality as rational mutual agreement, with an evolutionary account of moral sentiment.

If any of these succeeds, the moral argument's key premise ("no God, no objective morality") fails, and morality is secured without God. The theist replies that each secular grounding either smuggles in a quasi-theological objectivity (non-natural Platonic facts are as "queer" as Mackie charged), reduces morality to something less than categorical (mere flourishing or agreement), or cannot explain the authority of obligation. The standoff is exactly the one diagnosed under the moral argument: whether to run modus ponens (real morality → God) or modus tollens (no God → no real morality), which depends on one's relative confidence in objective morality versus theism.

Where religion and morality sit

The relation of God to morality is governed by the Euthyphro dilemma: theistic ethics must avoid both the arbitrariness of pure voluntarism and the independence of pure intellectualism. The mainstream escape — Adams's modified DCT, grounding goodness in God's nature and obligation in God's commands — is the most promising route between the horns, but it leans entirely on divine simplicity/goodness and faces the charge that it merely relocates the dilemma to God's nature. Natural law offers a theistic ethics that sidesteps voluntarism by grounding morality in reason and human nature, at the cost of the is/ought gap. And the autonomy objection raises the worry that any command-based ethics degrades moral agency into obedience. The decisive question — whether objective morality needs God — is the moral argument seen from the inside: the Nietzsche/Mackie tradition agrees morality is God-dependent and concludes (with God gone) for nihilism or error theory, while the secular-realist tradition (Platonist, naturalist, constructivist) holds that morality stands alone. Which way one turns this shared conditional decides both the moral argument and the meaning of life, to which morality is the gateway.