"The United States is a Christian-founded nation"

[Sword of Christ]

Shared experienced? This is sound like a group of people around a table, and each person is injecting themselves with heroine.

If you go on the premise that God exists then you have the potential for a shared experience of God to a group of people through a man who himself was in God in some mysterious sense. There is a possibility that Yeshua didn't have an Earthly presence and it was some kind of Platonic realm kind of thing but I see no good reason why a literal historical flesh and blood Earthly teacher couldn't exist. He even says the odd thing that Christians find embarrassing or uncomfortable but they recorded it anyway showing they took pains to try and preserve the oral tradition and there were many religious preachers, healers and magic workers with their following around at the time so there is nothing at all historically out of place about it.

If you go on the materialist premise then humans can just be nuts for no reason and can believe in all kinds of bull. The trick is demonstrate that the material premise doesn't really hold a lot of water if you really consider it. If you have an eternal purposeful creator of the universe then certainly you have scope for interaction and revelation however that is achieved and what better revelation than to have God himself in the form of a man? This is a God we can relate to, he's a God who is right here among us and can experience human life and suffering he isn't just out there distant in outer space with a booming voice.