Why do atheist demand proof the Bible is real, but no proof that evolution is a fact?

evolution is a scientific theory...is it the best explanations science has come up with to explain how man came to be...it is the best observations scientist have come up with to explain how man came to be...it is a scientific theory that have never been proven 100% correct...thus making it still a theory and not a fact...science demands theories be proven 100 percent before they become facts...religion does not...religions requires faith...but many evolutionist have faith that their scientific theory is 100% fact when it is not...i am not telling atheist what they should or should not believe but keep prospective on who they call fools for what they believe when both have no certainty of proof...