The Crusades started because the Muslims would not allow Christians to visit the holy places in Jerusalem. The 1st Crusade was really nothing more than an armed pilgrimage to the Holy Land in defiance of the Muslim restrictions.
Actually, the Crusades were started because Urban II wanted to re-establish his Street Cred against the anti-Pope Henry IV had set up in opposition to him. And the Crusades probably did more damage than good, as it hastened the demise of the Byzantine Empire. My personal favorite being the Fourth Crusade, which never got near a Muslim.
Obviously, you learned your history in a university that teaches about Talking Snakes in Science Class.
The conflict the US has had with the Muslim world has never been religious or ideological. It was mostly connected to the power struggle in the Middle East because of the Cold War and to secure stable oil supplies not only for the US but for the rest of industrialized world.
Yeah, and **** those people who rightfully owned the oil. If they complained and threw out their corrupt Shah, BP and the CIA would put that asshole right back in!!!