When I hear theists and atheists pontificating on how they know God does or does not exist, I can only smile at the irrationality and, yes, vanity of the notion.

We can know that the Christian God cannot exist. If he is all-powerful and all-good, as Christians maintain, there would not have been, for instance, the Holocaust. This is an inherent self-contradiction. So if Christians insist on having a God, they can do so, but if they have any respect for logic they'll have to redefine who he is.

Just look at what is right in front of you. People don't do that. They see what they expect to see, what they want to see, what conventional wisdom tells them to see. They only hear the music and not the lyrics of human events.

God's only excuse is that he does not exist.

Perfection does not exist - only God is perfect.

Atheism is really nothing but a sorry litany of non-sequiturs, e.g., if God existed, why do we have all the evil and horrors in the world? But this presupposes that God is all-good, an obvious non-sequitur.