If god's real, then I would assume he has simply always exsisted. Biting into it, there's probably shit in this universe that our puny human brains cant even comprehend.
The God is in all of us... we are the God. I am serious. We come from the light and we go to the light, after we die. We just wont remember it, after we are being sent to this earth, because we have to forget our past lives before reborning. Atleast thats what I have read.