Ok in short, the answer is something must exist to begin with, in order to create something else out of it. Logically then Energy must have prevailed all times , hence it cannot be destroyed, if it were possible to destroy energy then only the question arises where did the energy come from. If Energy cannot be created or destroyed, then it must have existed all times even before the universe was born. Therefore the question does not even arise where did this energy (God) came from. It may prevail in many dimensions that we simply cannot comprehend, and we can only study the dimension we are in, so i am afraid we will never see God in his eyes in this dimension. we just have don't have the ability to possibly do that, but we may see the after effects of his creation, we have limited senses, one of which is vision, with which we can see his creation but not him, and in the same way we cannot see Electricity, or nuclear partical that we know exists and can be deadly, we need to get into spiritual dimension to to feel or sense or see him indirectly, we won't ever see God eye to eye, we just can't, we haven't the ability so why then dismiss God's existence.
Here is my long version of the answer:
So when you asking where did God come? from which I have already classified God as some form of Supreme & Divine Energy, in other words Mother of all Energies in and outside of the Universe.
You see, if there was no God, or let us put it this way, if there was no Supreme Energy, from which all other sources of energies were derived, e.g. the sun's fission reaction is what is sustaining all life on earth, churning our oceans, and powers our planet, without the Sun we would simply not be able to exist, but even the Sun had to come from somewhere, yes indeed it was born as a result of the almighty big Bang! but ever wondered who triggered it or what caused that big bang?
In my opinion, the big bang was the result of transformation of that Supreme energy into the creation of the Universe, without this Supreme Energy or if you like you may even call it Master of all energies. (God)
You see my friend, common sense and logic says that if Nothing ever existed, before anything existed, then nothing would have emerged from Nothing, even in a Zillion, trillions, and billions of years, but unfortunately we humans have limited capacity to comprehend things, and we rely on the fact that everything must come from somewhere, yes indeed we are right, everything must come from somewhere, or it simply couldn't just happen with a click of your fingeres, things have to or come into existence,
all things that exist, that we can feel touch, and see, physical things, material things came into existence and we know how, science says that all matter is composed of Energy, which is indeed true. hence why we say E=Mc2,
However, just because we cannot see Energy or Master of all energies, does not mean they do not exist, only because they do or did exist that it was possible for these energies to be transformed into things (matter) or universe and within this matter we have energies floating all around us, the heat, electricity (electrons) and magnetism and gravity, no one can see electricity. But we know it exists and we rely heavily on it.
Similarly, we cannot see nuclear radiation, we know how deadly it is.
Then we don't fully understand gravity and magnetism, and we are still somewhat confused about light, as we often call it as a wave of energy and then we also know that it has particles called photons!
I often wonder why by bringing a mirror in the path of light that these photons don't collide head on with the incoming photons to those being reflected or bounced off the mirror, we should see some spectacular collisions of photons! but we do not see that.
So yes, where did this Master of all energies come from, the answer is very simple, it always existed, there was or is no such thing as a state of Nothingness, Nothingness did not exist, in that space time, before the universe was born, Nothing simply did not exist, only that the universe itself may not have existed, but something else was always in existence otherwise I doubt if universe would have possibly emerged at all from absolute nothing, (it just can't no matter what) and that you and I were able to discuss this today, what existed was something and it always had existed.
There is no question of it where it came from, just think out side the box, and think why it need to have come from somewhere? instead think of it that it must have always existed but through different forms, always in existence and can it simply cannot be destroyed. or made into non-existence, as then the question is where would its by products go? they would still remain somewhere won't they?
So just imagine a space time limitless boundary, infinite, filled with this supreme energy, what appears to us is as an empty space, because we only comprehend seeing real objects and real matter, so we say they exists, those we don't see simply see with our eyes or with our primitive instruments, does not mean this energy don't exists, and or that there was a need for it to have come from somewhere, instead we should be saying how can we transform this energy into nothing? indeed we may well have problem to create absolutely Nothing in this huge universe or outside it, we simply wouldn't be able to create Nothing!
Empty space as we see like a glass of water, if the water is missing we can say for practical purposes that the glass is empty, but glass can never be empty, it will have something inside it, that we cannot see, it will have the gravity lines of attraction or waves passing through it, it will have magnetic lines of force passing through it, other particles invisible to our eyes could be filled in it, even if we remove total air from it, and even if we block all light from it, we cannot make anything into nothing, if we tried we will end up forming other things from it. hence the state of Nothing cannot exist, it therefore why we are here in the first place that something was there that we are here today.
So I am afraid, I think that Nothingness never existed and never has, and that what we actually see as empty space between stars or planets is not actually empty space, even the space outside the boundary of our expanding universe is filled with something that we just cannot see or feel or detect yet, and it is this that transformed the creation.
Arn't the scientist thinking that universe contains more matter/energy than we can see or calculate, 80% more than we can see.
So you should not be asking where did the energy come from, you should be asking can we destroy this energy and the answer is Nope, i am afraid, if you were to destroy energy, you would create a void with nothing and that is impossible, as that state cannot exist in true space and within the universe, so thank god that he was there or none of us would be here today!
So the argument is not about weather God or Supreme Energy Exists, but the argument is that is this Energy the God we often refer to?
I think so very strongly. In his many forms, or dimensions, one of which may be spiritual energy, that not many of us have looked into, some have and indeed they have found baffling things, e just haven't masterminded the art of discovering God's spiritual side, we know about his creative and destructive side! Oh well must now sleep! sweet dream, i might dream him in my dream, best form of sensor, his divine energy interacts directly inside the head! How do you think Mosses heard God speak? Or Mohammad for that matter.
