Hmm, I am an atheist and i believe no god exists. I also think that we should define atheism as such. Belief that no god exists. I wouldn't say that i do this on faith though. I would say that i believe this, rightly or wrongly, because belief is not a choice. And the evidence and my experience have persuaded me to this conclusion. I do not believe this way in the despite reason or proof, i believe this way because of reason and proof.
How can you have proof that something doesn't exist? That would require an inclusive knowledge of existence that we humans don't have.
Also, how does your experience act as proof of anything? What experience did you expect to have, of a metaphysical being, that you didn't get, that then eliminated the possibility of of that being's existence?
Also, just to clarify, to accept or not accept an idea, observation, or an experience as "evidence" of some proposed truth is our choice. And based on that choice, we then believe or do not believe that proposal is probably true, or untrue. So belief
is a choice. Even if the criteria we use for establishing our "evidence" is biased, and even though we remain may ignorant of the process by which we make these choices.