You cannot prove that God exists or does not exist. No one can.
Only if you set the boundaries of proof to restrict the evidence that God does not exist. What's tangible enough to prove, even if that were the restriction, is the history of human superstition, myth, legend and fable leading to the contemporary presumptions of deity, divinity, supreme power over the universe, and the bizarre fascination with the foreskin of bronze age goatherds in connection with the meaning of life and ultimate reality.
The whole reason for God is to see who of us has faith that God exists and who does not.
In other word God wants Dorothy to ignore the man behind the curtain?
God exists by faith alone.
You must be a Protestant. An orthodox Christian would say "faith and works".
God exists for those who believe, God does not exist for those believe he does not.
That changes the definition of "exist" to the point the definition itself ceases to exist.
The manifestation of a concept is related to our ability to be conscious of ourselves and the world.
God is a concept?
This is a quantum probability concept and comes from our own quantum properties of our brain.
Is the brain any more or less "quantum-effected" than ganglia, and other neurons in the rest of the nervous system? I can't help but noting a proclivity toward pseudoscience (as per Creation 'Science') in this.
As you all know quantum world can manifest an object's existence and at the same time the same object will not exist as well.
That's a description, at a scale in which "at the same time" is somewhat dubious. But even taking that as a form of experiential reality, how would it come close to explaining God?
This goes far beyond the Shreddinger cat problem...
(brings to mind "shredding the cat" which is maybe a little more macabre than letting a hammer fall on it.) Well the possible connection I see here is: God exists in the mind of the believer, while at the same time nonexistent in the real world. I think that's a definition that all non-believers could subscribe to.
Pray, and see how far your faith goes.
Does that include praying that superstition depart from this world and never return to haunt us? (What's needed in an atheist's hymnal containing all such expressions of hope set to music, just to keep pace with the Big Band fervor of televangelism and the livelier churches.)