Spinozism - Wikipedia
A couple of quotes from that article:
Spinoza wrote: "as to the view of certain people that I identify god with nature (taken as a kind of mass or corporeal matter) (all by itself and without intelligence, etc), they are quite mistaken"
"During his time, this statement was seen as literally equating the existing world with God - for which he was accused of atheism. Spinoza asserted that the whole of the
natural universe is made of one Substance, and that substance he called "God".
"While the natural universe humans experience in the realm of mind and physical reality is part of God, it is only two attributes – thought and extension (expression) (and substance) – that are part of infinite attributes emanating from (or coming from, or starting with, or beginning with) God."
"Spinoza argued that everything is a derivative of God, interconnected with all of existence."
In short, Spinoza, from what he knew of of this universe/world/reality, saw "intelligence" in it, or behind it, etc, and he reasoned that God's "body" was quite literally all the "substance" of all of it, etc, which is also what Einstein believed, etc, due what he knew and observed, etc...
That the story of that God was being played out in the substance or material of this universe, etc...
And that determinism from the very beginning was true and was the "law" from the beginning, that originated with "God" in the beginning, etc...
That He/They made nature and the laws of nature, but was "one" with it/them, etc...
This is quite literally the "Father God", etc...
All is His "body", etc, and all is being played out in all that is His body, which is "all", etc...
Not God in and of the OT, nor Jesus Christ, but a One who is and has always been above and beyond them all, etc...
So far beyond, in fact, that He cannot/could not show us Himself personally, or in a personal way, without the other two, etc...
Or at least, that very last part, is one of my theories, etc...
God Bless!