One of the strongest objections to the moral argument for God is the secular humanist response: we do not need God to live well. Compassion, reason, empathy, and the basic human recognition that other people’s suffering matters — these are real, they are widely shared, and they do not require a divine legislator to justify them. Religious traditions have no monopoly on goodness, and the history of atrocities committed in God’s name suggests that religion is at least as likely to distort moral perception as to sharpen it.
This objection is largely correct as far as it goes. People do live ethically without religious belief. Atheists are not less moral in their behaviour than believers, and in many measurable respects they may be more so. Secular ethical traditions have produced serious and sophisticated moral philosophy. The argument from “God is required to be good” to “therefore God exists” is not valid.
But the argument from morality is not that God is required to be good. It is that God is required to explain why goodness is real.
The distinction
There are two different questions here that are frequently conflated. The first is motivational: do people need to believe in God in order to act morally? The second is metaphysical: what makes moral facts true, and what grounds their claim on us?
The answer to the first question is clearly no. Atheists can and do act with great moral seriousness. The motivational argument for God from morality is weak, and the secular humanist is right to reject it.
But the second question is different. When the secular humanist says “I believe it is genuinely wrong to harm innocent people, not just that I prefer they not be harmed” — what makes that belief true? If it is true, what kind of fact is it, and where does it live in a purely physical universe? The secular humanist cannot say that moral facts are just social constructs or evolutionary responses without conceding that they are not genuinely facts at all — and a world without genuine moral facts is not the world the secular humanist actually inhabits.
The humanist dilemma
The secular humanist typically appeals to human flourishing as the ground of ethics: actions are right if they promote flourishing, wrong if they diminish it. This is a serious position with a long philosophical history.
But it faces a structural problem: why ought we to promote flourishing? The claim that we ought to promote human flourishing is itself a moral claim — it cannot be derived from the purely descriptive claim that flourishing is good for humans without already assuming that what is good for humans matters morally. And that assumption is precisely what needs grounding.
Furthermore, the scope of moral concern extends beyond human flourishing in ways that challenge purely humanistic accounts. The wrongness of gratuitous cruelty to animals, the moral weight of future generations who will never be in a position to reciprocate, the intuition that justice sometimes demands sacrifice even when no human flourishing is served — these edge cases reveal that human wellbeing is not, in fact, the whole of the moral story.
What this means
The secular humanist lives more consistently with theistic moral metaphysics than with the naturalistic worldview they espouse. The seriousness with which secular humanists take justice, rights, and the dignity of persons reflects an implicit commitment to moral realism — to the view that these things are genuinely real, not merely conventionally agreed upon. And moral realism, on examination, sits more naturally in a theistic universe than a physicalist one.
This is not a charge of hypocrisy. It is a suggestion that the moral experience the secular humanist relies on — and is right to rely on — points toward a reality that their explicit metaphysics cannot fully accommodate.