How do the residues of thousands of years of monotheism continue to bias even secular Westerners?

Why do people over-extend the correspondence theory of truth into moral questions? Do we over-extend the correspondence theory anywhere else?

Morality is objective in a given reference frame - but this reference frame comes from the same place as our biases - from our evolutionary heritage. If it is good to reject genetically programmed biases, isn't it also good to reject the genetically programmed desires and aversions that give us our sense of morality? If so, how to avoid total paralysis?