From a comedic tome (I found on my dad's bookshelf), written by an ex-Roman Catholic priest-turned-Protestant:
Best of all is for Protestant ministers to preach without ceasing to their people: "Do not marry a Catholic.Do not permit yourself to fall in love with a Catholic, for love is unreasoning and lures its victims into thinking that they are exceptions to all rules and experiences. Fear of the threats of the Church is greater than the love which a Roman Catholic girl or boy may profess for you. This fear will win out in the end and rob you of your love and happiness as well as the eternal salvation of yourself and your unborn children. [author's emphasis]
Lehmann, L. H. "The Problems of Mixed Marriages." Out of the Labyrinth. Chino, CA: Chick Publications, 1982. 202. Print.
There you have it, folks. If you marry a Roman Catholic, or even think of dating them, you're going to hell.