I agree. There are moral-cultural customs and norms that arise. My only point is that there is a divine moral law that is fixed and that undergirds everything. Any cultural morality that contradicts divine moral standards is in error. However, there are plenty of cultural moral norms that don't contradict divine moral law.

Simply put, divine moral law and cultural moral customs are coexistent realities. If morality is merely cultural morality, there is no basis with which to argue that any particular moral atrocities are actually atrocities.