Following a trail from the Reason Rally, I found this link from the National Atheist Party:
Atheism and Agnosticism are not incompatible at all. The problem is the colloquial understanding of agnosticism - it has been mis-defined in peoples’ minds as “I have my own belief, which may include a god figure or not.”
In fact, atheism is a position on theistic belief, and agnosticism is a position on theistic KNOWLEDGE. An atheist doesn’t believe that any god(s) or goddess(es) or supernatural claims exist because there is no evidence in favor of them. A theist believes in the existence of a god(s) or goddess(es) regardless of evidence.
I've had the Atheist vs Agnostic debate many time, but for some reason never came to this conclusion and clarity. I'm thinking about bringing this topic up again with some frienenemies but wanted to see if anyone here thinks this is too simplistic.