We invade countries that impose a threat. We invaded Germany, a Christian country. Religion has nothing to do with it. If you're Muslim and not a threat, no problem. You're a bit confused.
Germany had battleships, an air force, massive industry. It actually was a threat.
Iraq wasn't a threat to us. There wasn't any chance the Iraqi Navy was going to show up on our shores and invade New York.
But you have a point. Religion has nothing to do with it. They just have the bad luck of standing on resources we want... and if they don't want to give it to us, then man, their religion must be totally fucked up when they fight back when we try to take it.