moral progress

If Theism is True, Why Is There Moral Progress and Not “Moral Prophecies”?

If theism is true, why aren’t there “moral prophets” in the sense that they clearly perceive objective moral truths which are ahead of their time, such as someone 2,000 years ago declaring slavery is wrong, misogyny is wrong, etc.? Why do we instead observe moral progress? For example, why did much of humanity, for most of human If Theism is True, Why Is There Moral Progress and Not “Moral Prophecies”?