I am sure that I cannot adequately respond to your statements, but I will try and respond to some of them. In confess that the source of my responses is my faith, and as such, they will be of no value to you. But my responses at least comfort me, and may comfort others. And if there is no God (my faith tells me there is, but I acknowledge that my faith could be wrong. It’s the best this human can do.) then what is the harm?
It strikes me that almost all of the good that there may be in this world requires that there be some bad/evil/pain/(dare I say “sin”?). What are the human qualities we admire? Courage— how could this exist without turmoil and danger? Healing— how could this exist without disease? Compassion— how could this exist without the suffering of others? Love and caring— these exist because the NEED for them exists.
Do we fail? Of course we do. Such failure can lead to redemption and grace, neither of which can exist without our human failings.
Many of us (myself included) view the world and our existence as if we were the center of the universe. In my best moments I recognize that God is at the center, and not me. Whoever said that man was the most important thing in the universe? Even the environmentalists concede that point (although they replace it with Mother Earth or Nature; wrongly, in my view).
I agree with you that many of the worst acting people I have known proclaim religious faith. But, most of the very best, most compassionate and loving people I have ever known also proclaim religious faith.
For me, if God’s existence were provable, where would be the need for faith? And I believe that faith is what God asks of us.
As for any disproof of God’s existence, that will require absolute human knowledge of all things. Any gap in knowledge leaves room for God’s existence.