Moral relativism is probably the dominant popular view of ethics in secular Western culture. The idea runs roughly: moral judgements are expressions of cultural norms, personal preferences, or evolutionary programming. There are no objective moral facts, no moral truths that hold regardless of what any person or culture believes. When we say “slavery is wrong,” we are really saying something like “my culture disapproves of slavery” or “I find slavery distasteful.”
Relativism has surface appeal. It seems humble: who are we to impose our values on others? It seems tolerant: if there are no objective moral truths, there is no basis for cultural imperialism. It seems modern: objective moral facts feel like remnants of a pre-scientific worldview.
On examination, moral relativism fails at every level: practically, philosophically, and in terms of what its own proponents actually believe and live.
The practical problem
If morality is just opinion, then the statement “the Holocaust was wrong” is merely the expression of a preference, in the same category as “I prefer vanilla to chocolate.” A culture that decided to exterminate a group of people would have different preferences, and on the relativist view, no further moral comment would be available.
Almost no one actually accepts this conclusion. The people most likely to invoke relativism in conversation, typically to deflect moral criticism of practices they wish to protect, are also the people most likely to make absolute moral claims about oppression, exploitation, and injustice. Relativism is used selectively: as a shield when someone else’s values threaten to constrain behaviour, and abandoned immediately when injustice needs to be condemned.
The inconsistency is not accidental. Relativism is not a liveable position. To live is to make choices, and choices implicitly affirm that some options are better than others, in the moral sense and not merely the preferred sense.
The philosophical problem: self-refutation
Moral relativism faces a version of the self-refutation problem. The relativist claims that there are no objective moral truths. Is this claim itself objectively true? If yes, then there is at least one objective truth about ethics, namely that there are no objective moral truths, which contradicts itself. If the claim is merely the relativist’s personal or cultural opinion, it has no claim on anyone else’s assent.
The most common relativist argument, that we should respect other cultures’ moral frameworks, is itself an objective moral claim. The proposition “we ought to respect cultural diversity” purports to be universally binding, not merely a local preference. If morality is relative, the proposition has no more force than its opposite.
The anthropological evidence
Relativism often presents itself as the conclusion of careful study of cultural diversity: different cultures have different moral codes, therefore there are no universal moral truths. The premise is not as strong as the conclusion needs.
Anthropological work on moral universals has identified core principles that recur across every documented culture. The prohibition on murder of the in-group. The obligation to care for one’s children. The norm of reciprocity. The prohibition on theft within the community. The expectation of honesty in serious matters. The requirement of justice in the distribution of basic goods. These are not local preferences. They are the structural framework on which every successful human society has been built. The variations between cultures occur within these frameworks, not by replacing them.
The Islamic account anticipates this finding directly. The Quran identifies an innate moral disposition installed in every human soul:
The capacity to recognise right and wrong is universal because the Creator who installed it is one. The cultural variation across human societies covers the surface; the deep structure remains constant. Anthropological data confirms what the Quran describes.
What moral experience actually shows
The strongest argument against relativism is experiential rather than philosophical. Consider your actual response to genuine injustice: not your theoretical position, but your immediate gut-level reaction when you encounter a case of serious harm being done to an innocent person. The response is something like: “This is wrong. This should not be. Something has been violated.”
The phenomenology (the sense of moral reality, of something being genuinely at stake rather than merely distasteful) is one of the most consistent features of human experience across cultures and centuries. The relativist account has a hard time explaining why this universal phenomenology exists if there is nothing for it to be tracking.
The hadith literature notes the same phenomenology directly:
The Prophet ﷺ identifies the inner sense of unease that accompanies wrongdoing as a reliable signal of moral truth. The signal works in everyone. The relativist who tries to dismiss it as a culturally conditioned emotion has to explain why the dismissal does not also apply to the moral judgements relativists themselves continue to make.
The test that cuts through
Consider the statement: “The Holocaust was morally wrong, not merely widely disliked, not merely inconsistent with the preferences of most people, but actually wrong in the way that a true factual claim is true.” A reader who finds themselves unable to deny this, where the alternative feels not like intellectual honesty but like a betrayal of something they know, has already committed to moral realism. Moral realism, pursued honestly, leads back to the question of what grounds it.
A universe of particles and forces generates physical facts, not moral ones. “Electrons behave this way” tells you nothing about how anyone ought to behave. If moral facts are real, and the inability to regard the Holocaust as merely a matter of taste is strong evidence that they are, something beyond physics is required to explain them. That something is precisely what the moral argument points toward.
The Islamic articulation is direct: moral facts are real because they are grounded in the nature of the One who created the moral order. The universal phenomenology of conscience is the trace of fitrah, the innate capacity God installed in every soul. The cross-cultural moral universals are the evidence that the source is one. The atheist who feels the moral force of the Holocaust judgement is responding to a reality that the Islamic framework has the resources to ground and the secular framework does not.
Where this leads
The cumulative force of the argument is stronger than a bare claim that something transcendent exists. The argument points toward a single source of reality, reason, and moral order. The kind of universe in which moral facts can be real is the kind of universe in which a Creator has installed the moral order, given conscious creatures the capacity to recognise it, and called those creatures to live in accordance with it. From there, Islam presents itself as the most disciplined continuation of that line of thought: one God, one moral structure, one human nature equipped with the conscience to recognise both, and a revealed guidance that develops the recognition into a worked-out life.