that atheism is a belief like any other, it is not fact, and it is not science, it is a belief.
For me, personally, I have not found or been presented with sufficient evidence to believe in the existence of any sort of deity. I don’t consider it a belief so much as a lack of belief until sufficient evidence is provided. Which is a perfectly sensible default position towards any claim, really. My reason for deconverting was due to adopting much more stringent requirements for believing religious claims.
Only science is science. One’s thinking and epistemology could be scientific or non-scientific, though. Science depends on using good quality evidence to inform our theories.