No, Islam doesn't preach violence against other religions, but that's what many Muslims interpret the Koran to say. And these Muslim extremists are fighting a "holy war" against the USA, believe it or not. And it's because we're a mainly Christian country. There's plenty of Muslims out there who'd love to take down America.

"If a lie is repeated often enough, the gullible public will eventually believe it." -- Paul Joseph Goebbels (Chief Minister of Public Enlightenment and Propaganda for Adolph Hitler)