I've heard a similar one on those lines, which goes something like "you say that the bible/kerrang is false because God/Jesus/etc doesn't exist; well Christopher Hitchens doesn't exist, so all his books must be false".
At the age of five, Skagra decided emphatically that God did not exist. This revelation tends to make most people in the universe who have it react in one of two ways - with relief or with despair. Only Skagra responded to it by thinking, 'Wait a second. That means there's a situation vacant.'