To those saying religion didn't cause the terrorist attacks, that "moderate" Muslims are not dangerous, or that only Muslims are terrorists, you're all idiots. All religious doctrine, with a few exceptions suck as modern Wicca, demand acts of terrorism.
A terrorist act need not be violent, it only needs to use or create fear. Terrorism is a tactic of fear manipulation as a method of subjugating people.
A common example of peaceful terrorism, one that is used dogmatically in the USA, is to tell someone to obey or be subjected to intense torture. This particular method was created, and perfected, by Christianity, "obey my god or suffer for all eternity."
People in the USA tell this to kids, even the bogeyman stories are not as horrible as telling a 5 year old that if they don't eat their peas they'll be tortured forever. This is the face of terrorism that is always ignored by the masses who claim a higher morality.
So obviously Al Quaida is not the problem, Muslims are not the problem, Osama was not the problem, the problem is religion. Denying that religion fuels, encourages, and even demands terrorism is lunacy.