That is between you and God.  All of these questions, however, are matters of natural reason, not theology.  To say their are unchangeable is idolatry on your part.  If there is change (and so far most of what you are looking at has had no change in teaching), it is to make morality more in tune with actual humanity rather putting piety before the needs of the flock.  You seem to be like the pharisees who had their heads in their falactories instead of on the needs of their people, which Jesus condemned.