Why do Athiests require 'proof' that God exists?

[Annik]

You seem to be under the false impression that 'atheism' is the claim that there is no god. It's not. Atheism is the lack of belief in your claim that there is a god. That's why we have nothing to prove. Should I prove that I don't believe your claim? That's just silly.

So you're a weak athiest. That's fair enough. However as a weak athiest you must accept the possibility that God/God's could exist.

No. You don't understand atheism. There's a possibility, but there's also a possibility that there is a whole race of watermelon-cannon people that left me on this planet to fight crime. The chance is slim and not worth it.