Islam is a religion in which God requires you to send your son to die for him. Christianity is a faith in which God sends his son to die for you.
As quoted in an interview with Cal Thomas (November 2001), he later indicated that the remarks "do not accurately reflect what I believe I said", as quoted in "Ashcroft Invokes Religion In U.S. War on Terrorism" in The Washington Post (20 February 2002)