You can say the same thing about devout christians, and all of the fantastic stories in the bible.
Eeer... wait, looks like someone needs to get educated a bit here...
christians are separated into several branches... protestants, catholics, mormons, and tons of other little sects. There are mexican catholic christians who cant stand white catholic christians, black catholic christians who cant stand white or mexican catholic christians... see it's a bit more complicated that what you re trying to expose as an argument.
There are as many belief systems as there are individuals on earth It means there are 7 billions+ unique systems of belief on earth. Still, obviously, most of these individual system of believs are ALL mostly constituded in essence by the basic principles of the biggest religions. This is why you have racist, gay, vegetarian, firearm collecting christians, muslims, jews etc.
Now, most christians wether they are catholics, protestants, or from another branch, all behave PEACEFULLY, STUDY, WORK and build families ; they dont commit terror acts. Neither do buddhists.
ONLY MUSLIMS DO.