The logo for Christianity is a t. The T is a cross and yet SO MANY people got crustified. Jesus was probably a real person, but a lunatic. He told everyone he was the son of god, so does that mean that if I say I'm the son of a mystical beast from a fairly tale, you'd believe me? Over 3 BILLION people would believe me?
(The atheist logo is an atomic sign because atheists are booming!)