I think you are making a good argument, and I think we are getting a little bit into an edge case of faith here. So here’s a scenario: say you met a priest that tells you “Oh I am not sure if God exists, not at all. I just assume God exists and behave accordingly because that benefits me. Since I will get into Heaven when I die if I do so.”

Will you call this priest an atheist/agnostic? I don’t think either answer is right or wrong, just curious where people draw the line.