When people say they believe in God but acknowledge that God is incomprehensible and unknowable, what are they really saying they believe in?
They believe that the world was created intentionally.
They believe there is a purpose in things that happen.
They believe that there is an objective right and wrong.
They believe that there is absolute justice.
They believe in life after death (by necessity of the above belief).
Not all theists will agree to all of the above, though I think you would be hard pressed to find one that didn’t agree to most of them and downright impossible to find one that agreed with none of them. "God" is just the object they point to centralize where all these beliefs come together. It is theology which comes to explain how and why these believed truths about the world came to be. Many religions form to specify or fortify such beliefs.
So I wonder, if one believed in each of these independently outside of a typical theological structure, would he believe in God? I don’t think he would. "God" itself is not necessarily a beloved belief, it is all these other things which theists are really saying when they say they believe in God.