My son is 5. He has his own system of beliefs about things. I don't challenge them. But I will explain to him that people believe all sorts of things.
In fact, this morning, he was telling me that when we died we didn't come back, that we were just dead. I acknowledged and explained that that is what some people believe, and that others believe that we go to heaven to be with God when we die. Others believe we come back to life as new people (babies) or as animals, etc. And yet others believe our souls are energy that just go back to the energy of God, where we came from to begin with.
He's a very thoughful boy and I'll let him come to his own conclusions, with some small guidance from me. He says he believes that God is a woman and that she has a counterpart that is a male wizard with a wand made of rainbows.
I don't know where he got all that, but it sounds about as rational as any of the other myriad beliefs about gods.
I'll let him believe that sort of a thing until I feel he's ready to discuss unconscious archtypes, etc.