"Marc, the best advise I can give you is to answer each question with a question. I know that can be hard but it is a good way to deflect the argument (and good mental exercise for you). For example, "Arn't you going to…"
"I watched with great laughter the episode of Trading Wives when an atheist woman & the nut you showed on the video traded places. While the atheist remained rational for the two weeks the nut case just proved her nuttiness. But what…"