“When people say they are atheists they don’t mean they can’t prove that there are no gods. Strictly speaking, it’s impossible to prove that something does not exist. We don’t positively know there are no gods, just as we can’t prove that there are no fairies or pixies or elves or hobgoblins or leprechauns or pink unicorns; just as we can’t prove that Santa Claus or the Easter Bunny or the Tooth Fairy don’t exist. There’s a billion things you can imagine and nobody can disprove.”
— Richard Dawkins