Fast Facts on False teachings says "It is philisophically imposible to be an atheist, since to be an athiest you must have an infinite knowlege in order to know absolutely that there is no God. But to have infinite knowledge, you would have to be God yourself. It's hard to be God yourself and an athiest at the same time! The Bible says in Psalm 14:1, 'The fool says in his heart,'there is no God''"