Lewis observes that "for Muslims, no piece of land once added to the realm of Islam can ever be finally renounced."13 We might also add that no mind, once added to the realm, can ever be finally renounced—because, as Lewis also notes, the penalty for apostasy is death. We would do well to linger over this fact for a moment, because it is the black pearl of intolerance that no liberal exegesis will ever fully digest. Within the House of Islam, the penalty for learning too much about the world—so as to call the tenets of the faith into question—is death. If a twenty-first-century Muslim loses his faith, though he may have been a Muslim only for a single hour, the normative response, everywhere under Islam, is to kill him.