I’m not defining religion as “fake stuff”, but I am saying that it’s not a religion if there isn’t an inherent element of uncertainty. You ask any Catholic priest and they will tell you that part of what is integral to their religion is the “mystery of faith”. In other words, their religion intrinsically relies on a lack of certainty about the nature of their beliefs. If a religion was provable, it wouldn’t be a religion. It would be science.