Another theory is that the Creator God (who is all of existance, planets, people, space, etc)engaged in a "fragmentation" experiment
and fragmented himself into physicality. (3 dimensional)
Since then he has been experiencing physical existance thru us, (dogs, trees etc) and we are all working out way back into the God mind.
In this scenario, books like the Bible and the Koran are mere expressions (written by humans) seeking their God aspect. We are working UPWARD back into Godness and Oneness.
Perfecting and growing in wisdom as we go.
Eventually a stage will be reached were God becomes oneness again.