So, we have realised that God without a universe would be rather lonely and bored – there would just be eternal nothingness and His eternal thoughts about nothing.
Now, I expect that an omniscient God would be smart enough to figure out that there would be some fun in experiencing more than this. He may have come up first with a black and white (or even sepia) photo. Boring. How about a colour photo? No, still boring. How about a moving picture? God could watch movies all day. Well, how about a live action world that He could sit up here and watch? No, this is all still very superficial. He needed to really experience what He was seeing.
Therefore, I submit that God-Consciousness did just that. He did not create a world that He could watch voyeuristically from Heaven. No, He created a world that He could take part in and experience first-hand.
God-Consciousness is eternal. This means that He had no beginning and will have no end. Does this mean that He experiences all time at once? That is beyond the knowable and understandable. It is in truth, incomprehensible. Whether that is true or not, one imagines He might be interested in seeing how things progress sequentially. To see everything at once might seem to be an unholy mess, to use a word. When you have all time (and beyond), why not see some of what you can experience sequentially. See it develop. See it change. See evolution.
God-Consciousness is omnipotent. This means that He can do anything, and there is nothing that is too big or too powerful for Him to achieve. Handling a Big Bang is not an issue.
God-Consciousness is omnipresent. This means He is everywhere: in every cell in your body, and in everything that you do, be it good or bad. He is in every square inch of the universe. He experiences the universe from within.
God-Consciousness is omniscient or all-knowing; therefore, if He needed to figure out the constants that govern the universe, that would not be a problem. If He had to figure out how evolution would work, that would not be a problem either. Neither would the Law of Gravity, the Laws of Mathematics, the Laws controlling the structure of matter, and so on. God can figure it out and set it all in motion ahead of time. Bearing in mind that He is outside time if He chooses to be, He can be sure that all the things that need to be in place for the future will be there when they are needed.
Therefore, God-Consciousness had the motivation and the ability to create the universe, and that is what He did. He also did not create something out of nothing, as that is impossible. What He did create was the universe out of His very essence. He created the universe out of Consciousness.
(Parts of this blog are quoted from Chapter 8 of my book, The God Franchise)