Muslims are to Islamic Extremest as the KKK is to Christianity.
Being "born out of" is very different than being "part of" and the trouble is the refusal, or inability, to make the distinction.
Fanaticism exists in every race, religion, culture and walks of life and too many time blanket statements are improperly (and most often) used by those that don't understand - to promote fear.
I'll be the first to say that I only know what most people who have not studied the Q'uran. Kill the infidels and receive virgins.
That's not knowing very much but if you want to learn more, here's a great place I ran across to do it.
http://www.quranexplorer.com/quran/