Muslim and Christian groups are squaring off in an Albany federal court in a defamation lawsuit over a book on terrorism. Muslims of America says the Christian Action Network is telling deliberate and damaging lies by reporting terrorist training is happening at their enclaves--which includes one near Binghmaton. The group is seeking retractions and $18 million in damages. It also wants to halt publication of "Twilight in America: the Untold Story of Terrorist Training Camps in America.'' The Christian group refuses to back down, challenging the Muslims to prove them wrong in court.