Karl Marx once infamously referred to religion as "the opium of the people", and argued that it served to dampen the revolutionary fervor of the masses. Yet if Marx were alive to witness the acts of ferocity being committed by zealots in the name of Islam, one suspects that even he would readily admit he got that one wrong. Just such a reconsideration of religion is taking place today among the remnants of the Marxist left in Europe and North America -- only their reassessment is taking them in an even more dangerous direction. Since the morning of September 11th,...