I think for some it's a way of making them feel better about their own belief. "See? You believe in silly things too, so we're equal!"
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.'