Of course Atheism is a belief. The question is whether it's a true belief or a false one. You obviously think it's a false one, but the arguments I have all seen are guilty of the fallacies described in this paper. I doubt if yours are any better, although it would've helped if you'd give us some links to those arguments.

https://www.academia.edu/43960326/Science_Reason_and_Agnosticism