Why should they,since God is nothing but a myth created to scare the superstitious?
It may have eventually been used that way, but think about this: you are an archaic Homo sapiens-type of creature walking with your little tribe during a summer afternoon in what we now refer to as Bavaria. The sky darkens...streaks of yellow light cut the grey and loud, booming noises also come from above; a few minutes later torrents of water are on you.
Sir--no one can now talk you out of a belief in a Higher Power. I submit tht scenes such as this happened all over Asia, the Americas, etc., etc. to bring out the beliefs and fears that would eventually be molded into modern deities.