Actually, the Muslims highly revere Jesus. He is one of their most treasured holy figures, but is considered secondary in importance to Mohammed, that's all...not surprising, considering that Mohammed launched the Muslim faith...which was itself a further development of the Judeo-Christian faith. To suppose that all this happened because of someone that "never existed" is like supposing that the Mississippi flows out of a watershed that never existed.

The Muslims, of course, are less enthusiastic about the organized Christian churches (Christendom) than they are about Jesus... (but Jesus was not a Christian anyway...he was pre-Christian) :-)

Matter of fact, he completely transcended Christianity (and all other organized religions) in the power of his message and example.