What is 'objective' value?

[Neo-Scholastic]

To make sense of objective, intrinsic human value one must appeal to a source transcendent to human beings, from which humans derive their value.  What is that source if not God?

As formulated you are putting forth an argument from ignorance. I agree that objective value (in the sense it's being used in this thread) must be grounded in something transcendent, but some have proposed transcendent principles that stop short of the Judeo-Christian God. They believe Kant's Categorical Imperative or some such principle would satisfy.