Islam and Christianity are ridiculously similar. I can see how this kind of thinking could apply to, say, two totally different religions like Hinduism and Judaism, but Christianity and Islam are both religions of the book.
They both believe in One True God, and they both have incredibly similar values. They've both gone through periods of conquest and horrible atrocities. They both have major glaring faults, including the fact that they allow asshats to interpret passages in ways that allow them around the base morals of God.
Their allegories are very similar as well, as are their philosophies and histories, especially when compared with non-of the book religions.
Muhammad was great man, just as Jesus was a great man.
I honestly believe that had Christianity developed where Islam has developed today and vice versa, little would have changed. I think the so called differences in philosophy are insignificant when you take into account personal interpretation, interpretation by the clergy, cultural influences ect...
Think about how many people in the West believe covering one's face as a woman is a Muslim thing, when it is in fact a holdover from Persian culture. Couldn't we easily say the idea of the Clergy itself exists outside of Christianity? That the acts of the Clergy in the Dark Ages were basically independent of the true core of the religion? I don't believe Jesus nor Muhammad would approve of what their religions have become.
Or maybe I haven't read enough. /shrug/
If you honestly believe the Middle East wouldn't be as fucked up if they randomly decided to convert to Christianity, please, do tell how that would be.