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When the same people don't care much at all about offending Christian beliefs?
Art that is offensive to Christians (Piss Christ, Elephant Dung Mary, etc) is defended as freedom of speech. Art offensive to Muslims is criticized and censored to avoid hurting feelings and inflaming tensions.
Non-religious Americans think it's pretty silly to worship a Jewish carpenter whose rituals include symbolic cannibalism. Why is there so much reverence and respect shown to a religion that kneels on a rug 5 times a day and prays to a bigamist pedophile and a big rock in the middle of the desert?
Show the same respect to both, or the same lack of respect to both. The the exception of a few mentally ill loons, the worst thing a Christian will do is bore you to death.