@FBM,
Except to the extent that I continue to insist that you have beliefs which you cannot provide unambiguous evidence for (and you keep insisting you don't), your position is unassailable.
No one is going to be able to provide you with unambiguous evidence of the existence of God.
Yours is a very interesting and fundamental question: "Why would God not want to provide us with unambiguous evidence?"
The typical answer to this question is: "Because he wants us to come to him through faith."
Obviously the next question is "Why does he want that?"
One answer, and the one that resonates with me, is that he has imbued himself in all of us and that in order for us to return to the godhead we need to find the way on our own. Providing a clearly defined path and absolute proof of the endpoint makes the journey far less arduous and thus less meaningful.
There is, of course, a strong mystical element in this answer, but I don't think it's without experiential support. Irrespective of the existence of God it is a common cultural theme that, to put it simply, the best in life doesn't come easy. This may be a way that our culture has come to grips with the fact that life is hard, but my personal experiences largely, if not exclusively, confirm it. So I am inclined to believe that anything of true value requires determination and effort. It would follow that the ultimate true value: returning to the godhead requires the same, if not to the greatest of degrees.
We can also argue, perhaps not convincingly, that God's greatest gift to us is the ability to perceive his existence and thus launch ourselves on the proper path (to which I hurry to add I am but a couple of footsteps down myself).
I can only try and imagine the unknowable and hope that insights along the way prove accurate.
If there is a Supreme Being, he/she/it/ur is the ultimate creator. As I believe that God has imbued himself in us I also believe that I have the opportunity to glimpse him through what can be called altered states of consciousness. One such state is obtainable through the creative process. There is a common expression of experience among creative people (artists, writers, composers etc) which is that they reach a place where they don't seem to even know where their creative expression is coming from. It simply flows into them. That's a rare state to obtain, but I've been fortunate enough to achieve it and it is exhilarating. I have extrapolated that this is what the Ultimate Creator must feel, and the only way he can achieve it is by not knowing how it all will lay out. A nice trick for an omniscient being, but he's also omnipotent. In any case if he takes a hand in our lives (or the lives of his other creations throughout the universe) or makes it clear he exists and how to return to him, the state can't be achieved.
But enough of that.
No one can prove God exists and no one can prove he does not. You can argue that in the absence of evidence I have engaged in some dreamy psychological self-deception to make myself feel good and I can say you have too narrow a perspective and are bound by your physical senses.
The question is what difference does this difference in perspective make? Other than us both feeling sorry for one another, I say it doesn't make any.
I am glad that you (and I think I'm right about this) don't offer the childish argument so often made that if there was a God, horrible things wouldn't happen, babies wouldn't die and rabbits would have their throats ripped out by foxes. Or that the sins of humans who claim to commit them in the name of God must be imputed to him.
In the end it comes down to what do you intellectually feel comfortable with. If for you that is a conclusion that there is no god, fine. If for me it's the opposite that's fine too. Neither conclusion obviates the need for human morality and neither should, in any way, be an excuse for immorality. I'm convinced that "believers" and "non-believers" can agree on basic tenets of morality, so neither of us poses a threat to the other.