Now for the reason the Church requires the above. One of the reasons that the Church exists is to safeguard the souls of those in it’s care. If a Catholic inisits on marriage to a non-Catholic, the Church allows it, but wants to protect the soul of the Catholic in the marriage by making sure the Non-Catholic understands the moral teaching and obligations of the Catholic party, and assure that the Catholic is not in a position hostile to his or her faith.