Well, religious text is always taken relatively. For instance, take the Bible, and put it in the same situation as Iraq, and you'll have terrorist Christian groups doing the same.
But Christian countries are at peace, their governments are very loose, and that is PRECISELY why you don't see such things. It's not to do with the religion, because any of the Abrahamic religions can be taken extremistly, it's to do with the environment that the religion is in.
@James: homosexuals are not innocent. I said No killing of innocence is justifiable.