If you could take the skewers of religion, those that riddle your frame, make you aware every time you move—if you could withdraw the scimitars of religion from your mental and moral systems—could you even stand? Or do you need religion as, say, the hippos in the Grasslands need the poisonous little parasites within them, to help them digest fiber and pulp? The history of peoples who have shucked off religion isn’t an especially persuasive argument for living without it. Is religion itself—that tired and ironic phrase—the necessary evil?