Does God Exist
God: You claim that a god being is inevitable. With that, I disagree. You claim that it is most likely something of Lovecraftian origin. Some higher planar being. Where do you get that idea? What evidence do you have that such a thing is possible? There is no evidence that these planes exist, and Dimensions are not alternate universes, or states of existence, they are degrees in which you may move, and do not define places. If something exists in this universe, it must by definition of existing within this universe exist in all dimensions. I exist in one dimensional space, two dimensional space, three dimensional space, and four dimensional space. If more dimensions of space exist than that, I exist on them too by definition of being within space. I cannot however exist in 3D space without existing in 2D space. It is contridictory by definition.
Upon that, there is only vague mathematical evidence that higher dimensions exist in forms of tiny curled up Planck Length loops at every point in reality. It may not be the case at all. If it is, the only thing that exists in these loops is tiny filaments of vibrating energy that define point particles by their vibrations. In fact, if String Theory is true, everything exists in higher dimensions, but is projected upon a 3D space.
Exist: No, not everything exists somewhere. The universe is infinite, but there are limits to what may exist. There isn't for example, a universe sized star. Everything that can exist in this universe may exist.
Taken together, what conclusions that I draw from this? I cannot draw any conclusions other than the question is wrong. Before one can begin question whether or not a god exists, one must establish that there is something to the concept other than scared sheep herders 10,000 years ago shouting at the sky because the rain didn't come on time. If we toss out every holy book ever written by man, and examine the universe without the concepts laid out in books like the Torah, the Talmud, the Christian Gospels, the Koran, the Vedas, the Tipitaka, etc, and just used what we can extract from the universe as we can perceive it, would we reach the conclusion that there exists a universe creator, all powerful, all knowing supreme entity?
At this point, the answer is no. At some point in the future, that answer might change, but for now, it is no.