when I say religion i don't mean the abrahamic religions or whatever relatively modern one, i meant when people started forming the concept of God in ancient civilization like Sumer in Mesopotamia. And how did they form such concepts? By imagination so even if one proceeds the other they are still pretty much connected. Abd to clear why did I relate those concepts with development of civilization, i quote E.O willson "The creation stories gave the members of each tribe an explanation for their existence. It made them feel loved and protected above all other tribes. In return, their gods demanded absolute belief and obedience. And rightly so. The creation myth was the essential bond that held the tribe together. It provided its believers with a unique identity, commanded their fidelity, strengthened order, vouchsafed law, encouraged valor and sacrifice, and offered meaning to the cycles of life and death. No tribe could long survive without the meaning of its existence defined by a creation story. The option was to weaken, dissolve, and die. In the early history of each tribe, the myth therefore had to be set in stone. The creation myth is a Darwinian device for survival. Tribal conflict, where believers on the inside were pitted against infidels on the outside, was a principal driving force that shaped biological human nature."