Yes, God is eternal. This means that God-Consciousness has no beginning and no end. It is difficult for us to conceive of anything having no beginning and no end because in our experience there is nothing like that. Nevertheless, logically, it is possible there could be something outside time. There is no reason whatsoever why Consciousness cannot be eternal. Perhaps a good analogy is the Laws of Mathematics. They are eternal would you not agree? No one invented 1 + 1 = 2. It just is, was, and always will be.
It is totally reasonable for God to be eternal, even if nothing else is. Everything has to have a cause, as something cannot come out of nothing. Since there needs to be a cause for everything, there cannot be a time when the Prime Cause, or the very first cause, did not exist. Going back to the very beginning of time and beyond, we find the Prime Cause, and because of Its absolute significance to everything that has followed, people have decided to call It God, or as I have suggested, God-Consciousness.
The conundrum of Which came first, the chicken or the egg? can only have one answer. God either created the chicken or the egg to start things off. I am not saying this in the sense of the Book of Genesis, but in terms of the theory of evolution. The process had to start somewhere — neither chickens nor eggs are eternal.
So, which came first? I would suspect it is God!
(Parts of this blog are quoted from The God Franchise)