Do atheists exist? I mean if someone states that God doesn't exist, isn't he/she assuming some agreed upon definition of god? Even in the simplest definition of a controlling force over the world, how can anybody be sure that it/he/she doesn't exist. There are difficult questions about the possibility of an omnipotent moralistic god for sure. But a God without human moral code, for example Scott Adam's concept of probability as God, seems plausible. Or a polytheistic system, like Indian or Greek, where Gods are allowed to be scoundrels!
The two issues that I have with atheism are: First, it assumes some specific definition of God; and second, it is too self-assured in its knowledge. I must confess, though, that I haven't done any reading on atheism as a philosophical system. So, I'd appreciate if anyone can enlighten me on this.