Since everything exists within the mind of the original eternal God then theoretically Universes, civilizations, and conscious beings existed to eternity in the past. Unless God evolved from a pool of pure proto-thought then as long as he had intelligent consciousness things had to always exist. Perhaps there was a time when his thoughts were abstract but even those ideas were reality since everything he thinks becomes reality. I would think one of the first things he have done is create other beings to keep him company. If he always existed then they always existed as well. It’s safe to say humans and our Universe are a mind boggling way down the line from infinite conscious beings, societies, and Universes.