If God created existence, God must transcend existence itself.
Thus the greatest idolatry: to say that God “exists” in the same way other “things” exist.
God cannot exist, because God is not a “thing” as such. Saying “God exists” is verbalizing a cosmic oxymoron.
To say that God exists is to deny God.
Existence and non-existence are attributes of our reality. How can we apply these conceptual labels to an eternal reality beyond us? Or even say that such a reality even “exists” in the same sense that our reality exists?
So in this sense, one might consider themselves an atheist; unable to annunce the existence of a Thing that cannot even be a thing.
If God “exists,” it is a kind of existence that is unlike every notion and experience we have of existence itself. Therefore, we cannot use our concept of existence as a descriptor for the state of God.
That would be idolatry.
But we might be “spiritual atheists” for exactly the same reason, since we cannot claim to fully comprehend everything beyond our experience of reality.
In other words, nonexistent things might ultimately “exist” in a way beyond our comprehension (lest we merely worship our own sense perception as some absolute in the universe).
Who are we to say that conceptual existence as we know it is necessarily the end of the story?
Theism claims a certainty that is idolatrious.
Atheism refuses to admit the finitude of it’s own mind.
Agnosticism is too certain of it’s own ignorance.
“Spiritual atheism” is something of a conceptual hybrid, allowing one to be intellectually honest, embracing of the mysterious unknown, and engaged with the practices of tradition and spirituality in a community of faith.