As anyone who has bothered to read the Koran and Hadith will know, it is page after page of vilification against unbelievers, infidels, apostates, women, atheists, polytheists, etc.  The following passages are from just the first few pages of the Koran. It doesn't take a leap of imagination to get from true belief to violent terrorism.

> "We shall let them live awhile, and then shall drag them to the scourge of the Fire. Evil shall be their fate" (2:126)

> "Slay them wherever you find them. Drive them out of the places from which they drove you. Idolatry is worse than carnage"(2:190–93)

>"We will put terror into the hearts of the unbelievers...The Fire shall be their home" (3:149-51)

>"Those that deny Our revelation We will burn in fire. No sooner will their skins be consumed than We shall give them other skins, so that they may truly taste the scourge. God is mighty and wise" (4:55–56).

>"Those that disbelieve and deny Our revelations shall become the inmates of Hell" (5:86).