Now let me explain how this works in actual practice.
I have long considered the proposal of the existence of "God", and have decided that I cannot know the nature or existence of such a 'being'. I can, however, accept that such a being exists based on my desire that such a being exist, and on the amazing and inexplicable mystery that existence continues to show itself to be. And furthermore, I can reasonably attribute some "divine", or "transcendent" attributes to this being as I have witness them being expressed within my experience of reality.
So although I can prove nothing, I can reasonably accept that some sort of divine entity exists as the source, sustenance, and purpose of all that is. And that I can witness the 'spirit' of this divinity, though not the actual character of it, in the expressions of love, forgiveness, kindness, and generosity that are occurring all around me, and in me, via my own experience of existential reality.
And I can test the "truthfulness" of this proposed 'divine being/spirit' by adopting it as the truth, and then living in accord with that truth as best I can. Which I have done, and found that it "works" by my definition of that criteria, and within my experience and understanding of existential reality.
Thus, I have chosen to become an agnostic theist, as I have deliberately have taken on that truth and have found that it "works" for me as 'the truth'.
I could at any time choose to drop this presumption of reality and truth, and try something other, but so far this is working well enough that I see no reason to bother.