Once more in defense of us atheists, an atheist is someone that dosn't actively believe in any god, not someone that believes they can absolutely prove there is no god.A-theos.
No-God.
Burn
Actually, Burn, it has been suggested that the early Christians were the first group to be referred to as atheists, for their rejection of the Roman pantheon of deities.
It's only more recently (16th/17th century) that the term has come to refer to one that is more apatheistic in philosophy.