Whether you look to the Bible, Torah or Quabbalah for an explanation as to how the word came to be, each one tells you that that before god created everything there was nothing. That is, no existance to speak of; no space and no time. this means that before God created everything the human entity could not exist, as there is no way for either the human soul or body to exist outside of existance. So if there was for some reason a way for you to exist in that condition you would not be able to tell the difference between one point and another, in either time or space, as neither exist as you are.
A sophisticated person might ask, "If there is no time, then how can you say "before the world was created, or after the world was created?" Well, the answer is both simple and inconcievably complex. the simple end is to say that only God can fully answer and comprehend that question, as it is impossible for a human, born and trapped in a three dimensional world , pushed along by passing time to possibly wrap thier head around the whole concept. It is possible, however, if not to begin to understand the concept itself, to see the scope of the idea. I'll try to explain the idea that i think best describes the situation, but I could be unclear , because It will be as I see it, not as others may.
God existed (exists) before (outside) of existance. I use the word outside because that is the word that comes closest to the right preposition, but it's not really the right idea, because the concept i'm trying to show here doesn't exist in the english language, or maybe even in human comprehension anyway, God exists outside of existance and so it's not that he "knows the future" or "changed his mind" that is simply the illusion that we see, Our minds and the minds of our ancestors cannot and could not understand the idea of existing ouside of time- which in itself is almost impossible to comprehend (try to imagine what that would be like and you'll realize it's impossible to grasp) so we saw the illusion that God "foretold the future" or "changed his mind" these are incorrect, because that would be implying that god lives along a timeline, either linear or relative, neither is correct.
therefore, you could say "the universe (meaning the portion of existance that we, humans, exist on at all levels; spiritual, astral, mental physical and emotional) has always existed, because before existance existed, there was no time, and as the word 'always' refers to time, the universe has always existed. [Note: A thought just occured to me: If time is contained within existance, then it has no beginning and no end, as the origin of the universe is impossible to comprehend with our understanding of time. taking this into consideration, that means time is relative after death, and if existance were to end then it will never have existed, which is impossible because i'm typing this right now, and that proves my existance. if I exist then the world exists and so existance has always existed.]
Conclusion: God exists outside of existance, aware but not subject to time, as he created it, and since he created it he is therefore all powerful. If he is all powerful then he is infinitely intelligent and omnipotent. If got were to change his mind (which is impossible, because that would imply that he exists within time) then existance would adapt to make it so the cause of the change never existed, and he would never have changed his mind because it would be his will all long (again impossible because god is not subject to time) I'd write more about WHY God has to exist, but i think i've written a long post already. I'll do so if anyone shows interest.