Religion
In reply to the discussion: Of course religion is connected to tribalism. [View all]MineralMan
(147,606 posts)Nomadic wanderers, mostly, goatherds and shepherds. There were chieftains and story-tellers and breaking the rules got you stoned to death by your fellow tribespeople.
Later on, those tribes got together, killed off other tribes, took their women, inhabited their cities, and formed larger cultural groups. The story-tellers adapted their stories to suit each new situation. Sometimes, they borrowed stories from other tribes and changed them around to suit their own needs. That's why so many stories are similar.
Religion expands and adapts to suit the needs of the culture it came from. In many ways, religion is having severe problems adapting to modern civilization. It may be nearing the end of its usefulness, but it will go down fighting, I guarantee.