Every religion has it's share of crazies. But they do not represent the majority of the faith.

I am a Christian. The Reverend Fred Phelps was also a Christian. (Allegedly) We didn't see eye to eye on much. Most Christians didn't see eye to eye with that jerk.

I knew a group of Iranian Muslims in college. They were very nice people, who dressed and behaved like the rest of us, except that they liked brighter colors, and they didn't drink alcohol. (Just very very very strong coffee.)