The non-realization of God resulting from certain philosophical arguments

A bit of a retarded question that for some reason bothers me.
The proof of the Rambam and the early philosophers that God is not a body stems from the conclusion that every body is necessarily complex and hence is not one and that things preceded it causally and temporally, and that every body is finite. But isn't it theoretically possible to say that there can be non-complex matter, (in my understanding a quantum particle is one of these, I would be happy for you to correct me if I'm wrong) and hence philosophically to conclude that there can be a "God who is a primitive body"? I would also like to know whether the claim that God is not a body because every body occupies a place in space and hence that space preceded it and it is no longer God is not better and stronger than the previous one, and is it somehow possible to posit matter that does not occupy a place in space (Julian matter?).
I would also be happy to explain the conclusions drawn from the Big Bang regarding the existence of nothing, existence of something, and primordial matter, if any. (That is, what of them is true for us regarding creation itself)
Thank you very much.