One of the problems I see in this discussion is the resistance to differentiating between “belief” and “faith”.
Belief and faith are TWO DIFFERENT THINGS.
Nearly every human has logical reasons to believe a lot of things, and for the most part, regardless of religion, we all believe in pretty much the same things.
Example: We all believe in gravity. When we drop a brick, we move our toes. Gravity is not a function of faith, whether we understand it or not.
God, on the other hand, is an object of "faith", and to discuss an object of faith in terms of “certainty” is nonsense.
That being said, I am 100% certain that I do not possess faith in the existence of a supreme being. . .or in anything else for that matter.