[TakeTheLeap]

There's one big thing you're forgetting here.
There's no viable proof. But that's faith. That's what religion gives people, is faith. Faith in themselves, faith in other people, faith in something bigger than themselves. Relgion gives people strength. People feel more empowered to fight when something goes wrong because they have God on their side. When something goes right, they can feel empowered because it might be something they accomplished, but they can also thank God.
Faith can give people a lot that science simply can't. Science often leads to more questions. Like religion, it isn't finite. It doesn't give answers to everything, but simply raises more question. Religion can fill in that gap so that, instead of asking more and more questions, you can be at peace knowing that something is in God's hands. Sometimes, that's all the more proof you need.