I went to the Miami Book Fair this past weekend. As usual, there were people hawking every religion you have ever heard of and then some: Urantia, Spiritism, you name it. There were a group of obviously Middle Eastern types peddling Korans and the like, and it was uncomfortable to see how people were shunning them, looking the other way, treating them the way I imagine lepers would be treated. I felt sorry for them, really.
But this does not change the fact that a huge portion of the Koran can only be described as gibberish, and some of the beliefs, such as Mohammad's one night horseback round trip from Mecca to Jerusalem is pure nonsense. I don't think that believing in this makes anyone dangerous, but it does indicate a certain lack of ability for critical thought, as do many oif the beliefs of Christian fundies and Jewish Hassids.
I never really had too much respect for Islam, and I have pretty much lost what respect I ever had for Christianity or Judaism as being believable or logical. Taoism, Confucious, and much of Buddhism make a whole lot more sense, and none of them claims to be the One True Religion.