On the simplest level, this old brainteaser is less like an argument than a pun, a noise emitted by the squeaky hinges of human thought. The question confuses us at first by disguising a negative as a positive. It admits that God lacks limits. But it notes that a limit is something, so God is lacking something, and therefore He isn’t perfect. You could say the same thing about flaws. Or feathers. Feathers are something, and they’re something good — God said so, in a roundabout way, in the book of Genesis. But God has no feathers (so far as we know). Therefore He isn’t perfect. One can imagine a boy in seventh grade Confirmation prep class substituting for feathers, “hooters.”...