The problem is that islam is not just a religion, but also a political system—a foreign EMPIRE whose goal is the conquest of the entire world and its subjugation to sharia law. That most certainly includes America.
Every American should see this full-length film, and educate him- or herself:
http://video.google.com/videoplay?docid=-871902797772997781#
Not to compare muslims and catholics in any substantive way, but the Catholic church has a serious political component, complete with a city which gets honorary ambassadors from other nations.