Ibn Warraq
Banned
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Actually, for most of history, Westerners couldn't decide whether Islam was some kind of Christian heresy (hence "Mohammedanism")
Obviously, I think labeling Islam to be a form of Christian heresy absurd, but it does make a certain amount of sense. I remember one Christian theologian(I can't remember who) argueing that if you believed in the virgin birth, the second coming, that Jesus was the Messiah, and you followed his teachings, then you were a Christian.
Well Muslims don't believe that Jesus was divine and believe that the crucifixion was an illusion and that IIRC the Romans mistakenly crucified Judas, but they do in virgin birth, that he was the Messiah and that he will return to Earth to usher in Youmud Din(Judgement Day). Also, IIRC they think he will battle Al-Dajjal(The Anti-Christ).
Having said that, I'm sure most Muslims would be either amused or offended, depending on their disposition to be called Christians.