Just thought you might like this. I was at a taping of “Who Wants to Be a Millionaire” last week and they have a comedian warm up the crowd before the show. In the audience were a Catholic priest and a female Lutheran minister. The comedian realized the potential comic gold on his hands so he tried to start trouble between them. He asked the Lutheran what the difference between Catholicism and Lutheranism is and she replied “We Lutherans believe we are saved by faith.” The comedian asked the priest “And what is it that saves Catholics?” “God,” the priest replied. That was it, he closed the debate and got more laughs than the comedian.
From EWTN Q&A forum