Our reasons for believing Jesus existed and also that He was who He claimed to be - the God who came down - are the same reasons for believing any fact of history: the documentation is substantial and it passes all the tests of historical reliability. Scholars - both liberal and conservative - overwhelming agree that Jesus of Nazareth was a man of history and the Gospels, on the main, tell His story accurately.

Why so many mentions regarding Jesus from such a wide variety of sources (Pliny, Tacitus, Lucian, Josephus, to name a few)? Because Jesus of Nazareth was a man of history, who made a profound impact on history. There's no good reason to doubt that Jesus existed, or to think the real Jesus was completely different from the one depicted in the Story.

In the Christian Story, mind and matter - invisible things and visible things - are both real. The Christian view is not the only way of viewing the world, of course. It has competition.

Whenever someone tries to deny the truth, ultimately, reality betrays him.

In matter-ism (materialism), there can be nothing wrong with the world since there is no right way for the world to be in the first place. Everything is just matter in motion and that's that. In Mind-ism (monism) there's a different route to the same problem. There cannot be a problem of evil, even in principle, since in Mind-ism even morality is maya; illusion. In neither story, then (if we're to be consistent with their principles), can the issue of evil be raised. But in real life the problem comes up all the time. That's the difficulty.

If the Story is not accurate to reality, it's not any kind of truth at all. So it can never be 'my truth' or 'your truth,' even though we may believe it. It can only be our delusion or our mistake or our error, but it can never be our 'truth.'

Evil did not catch God by surprise. He had a rescue plan, and He's still in the process of working out His plan.