You're kidding, right? There has never been a time when ALL people believed in God. Even the bible says that in the first book: Genesis. Cain and Abel were the sons of Adam and Eve and when Cain slew Abel he was banished to the land of Nod where there were whole cities of people who didn't believe in God. Regardless, I think the point here is that the darkness principle is based on obfuscation, illusion, and hallucination. It sounds like a good thing to me.
Most pagan religions revere black (aka darkness) as a strong color symbol of protection and positive energy. It's because of that b