They have divorced the faith from reason and married it to pop psychology, because they have bought into Kant's philosophy. What a man wonders about fills his heart and directs his thought. The starry sky above is the physical universe as known by modern science. Kant relegates everything else to subjectivity. The moral law is not without but within, not objective but subjective, not a Natural Law of objective rights and wrongs that comes from God but a man-made law by which we decide to bind ourselves.
Morality is a matter of subjective intention only.
If the moral law came from God rather than from man, Kant argues, then man would not be free in the sense of being autonomous. This is true, Kant then proceeds to argue that man must be autonomous, therefore the moral law does not come from God but from man. The Church argues from the same premise that the moral law does in fact come from God, therefore man is not autonomous. He is free to choose to obey or disobey the moral law, but he is not free to create the law itself. He said we must live as if these three ideas were true because if we believe them we will take morality seriously, and if we don't we will not.