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In An Enquiry Concerning Human Understanding, Hume argues that religion does not possess any epistemic authority; therefore, it should not dictate our moral principles. But Hume also observes that religion has an impact on human behavior, which is why it may indeed have some moral authority. The Enquiry Concerning the Principles of Morals aims to show the secular origin of morality and to emphasize that religion doesn’t play any role in it. At the same time, Hume introduces religious metaphors and analogies when addressing the moral authority of social institutions. In this article I discuss Hume’s stance toward the moral authority of religion by examining his theory of moral duty and interpreting his use of religious vocabulary in the context of his secular moral philosophy.