IF: in reality, people feared death and the unknown and had a lot of problems and sometimes felt 'all alone' in the world, and hated loneliness, and were intelligent enough to think about how things started and early ignorant versions of them saw that THEY created THINGS and therefore assumed that everything was created, and saw that the belief in a creator made life easier, and had the ability to decieve themselves, and intelligent current versions of them saw that this belief also made people easier to manipulate and control, and knew how to brain-wash people...

THEN: Gods are invented and maintained

ELSE: We have a civilisation based on truth, better or worse, who cares? I hate lies.