I suppose it depends on whether one’s definition of theist allows for a non meddling non-conscious Spiritual Force of Nature.
As I take it, man made deities are essentially the anthropomorphization of nature, gods are non-corporeal and are minutely concerned with and meddle in human affairs.
Distilled to their essence, I think this a fair view of Theist’s beliefs.
In contrast, a non-conscious Spiritual Force of Nature cannot and therefore does not meddle, has no concerns.
As best I grok your question, it boils down to whether or not the conceptual non-conscious Spiritual Force of Nature is corporeal or not.
If this Spiritual Force is taken to be Nature itself, Nature exists, no belief is involved nor needed.
Since that’s un-theist, it’s Atheist.
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For a couple of decades and long before I’d heard of Baruch Spinoza, I held to a concept of a ‘Cosmic All’ that encompasses everything that exists, everything that has and will ever exist.
My synopsis was that God is “Is”. A much larger concept of god than any presented by man made and allegedly revealed scriptures.
I think I became Atheist before I knew what it meant. Whatever shards of faith in biblical god that remained were irrevocably shattered and pulverized once I began reading the bible with intent.