@Thucy
I don't know who you are replying too, but I think there are some real problems with how you are understanding the problem.
First, you claim that if nothing contains God, then "God himself must be the universe that contains both the creator and the creation." God cannot 'contain' anything, because God is not corporeal, extended in space, or limited by dimension. The created universe contains everything physical that has being. God, being eternal, non-corporeal, non-dimensional, and non-extended, does not contain the universe, but is wholly separate from it. In fact, 'separate' is not the right word, because it implies that there is another realm or dimension where God could be pinned down. God is not found in any extension of space. He is spirit, and therefore does not contain the universe or have his being relate to the universe in any way.
This also answers your second point. The physical reality of the universe is wholly other from the non-corporeal entity of God's being.
This also answers your third point. To be speak of creation as being *contained* within God is to misunderstand the nature of God's being. In order for God to contain something, he would have to be extended in space-time. He is not extended in space-time because he is non-corporeal. Therefore, again, God does not contain the universe. The universe is the total quantity of all physical existence, and is dependent upon God's *will* for continued sustenance, but the nature of physical existence does not relate to the nature of God's eternal, infinite, noncorporeal being.
Your fourth point is the really interesting question. I would be interested to hear others' thoughts on this matter. I am thinking here of the existence of other non-corporeal beings, but also beings who are not eternal, such as angels. But this consideration does not seem to indict what you appear to be fishing for, namely, that God is somehow equivalent to the universe.