A case can be made for God being the Universe, in that it explains the origin of God as well. That is to say he must have brought himself into being
Anyway, I once held a similar belief, when I rejected the idea of God as a personal being. Then before long I rejected the idea of God entirely. Long story short, my path from childhood went something like this:
Fundamentalism -> Liberal Christianity -> Fundamentalism -> Deism -> Rejection of the resurrection of Jesus -> Rejection of God as a personal being -> Generic Neopaganism (involving God as the forces of nature) -> Agnosticism -> Atheism (and a period of uncertainty) -> Nihilism -> ?
I don't even know what I am now, but I don't think it matters.
There are other things in there that didn't last long enough to mention, or which I don't remember or don't know how to name.
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"If knowledge can create problems, it is not through ignorance that we can solve them." - Isaac Asimov