. . "Behold, he has become as We, knowing the difference between Good and Evil".
Mankind was turned out of the Garden of Eden (the grace of God) because he was no longer of the animals but entering the realm of the demi-gods - responsible for his own actions.
The Jews and much more the Christians and way much more the Moslems have been trying to return that responsibility to God ever since. 'Tain't gonna work folks. Ya can't get the tootpaste back into the tube.
The eating of the fruit of the Tree of the Knowledge of Good and Evil is a transition to be celebrated, not denied. The responsibility is to be accepted with honor. Sin is in trying to dodge it, thus the Catholic Church (and the rest of 'em) has sinned.