See, its very simple thing ,the god is MOST POWERFUL power . Which means he is already the most powerful thing then how can there be anyone with more power as he is already the MOST POWERFUL so there cannot be any further power exists than god because he is already the extreme powerful. Hope u get it.
So,that we can fulfill the missing element on this earth . When God created the earth and then the other substance like atmosphere ,water,rock,soil,plants,microbe,animals,etc,excexcept the humans. There was something missing for him and then the God created the first human who was a Man. But on such a big earth he was the only one of his kind. So the God thought to increase population,but only man can't do this so God divided his body in two parts , Man and Women. And then the life begin… hope u get it.