Depends on if you're using proof where evidence would be more appropriate. We have all sorts of evidence.
The difference between proof and evidence is important to understand, because they lead to the difference between knowing and believing. And religious people tend to be very confused about this difference. They are confused about it because many of them have been taught that the pretense of knowing is called "faith", when it is not faith at all. It's just pretense pretending to be faith.
We do not know that Jesus ever existed. We don't know this because we have no direct proof of it. And we have no direct proof because the evidence we have is all "second hand". There is no direct evidence.
So that when Christians say they "know" Jesus, and they "know" God's will, and they "know" the Bible is inerrant, and all that other stuff, they are only pretending to themselves and to others that they know it. Because they don't really know any of those things. They BELIEVE it, but they don't know it. Because they have no direct evidence of it that can be sustained anywhere outside of their own minds. And the difference between practicing faith, and practicing pretense, is the difference between their recognizing this lack of knowing, understanding it, and respecting it; or just ignoring it.
I know that Jesus Christ lives and lives in me. His existence isn't a thing I wonder about anymore than I wonder about who my earthly father is, but I can understand how that appears to those who aren't satisfied on the question and I certainly can't empirically, objectively prove that my experience reflects empirical, objective reality.
How it appears is how it is: you BELIEVE that Jesus lives in you, and through that belief, you've proven it. Jesus does in fact exist, as an idea, inside your mind. And that idea is real, especially to you. But none of this really has much to do with the question of whether or not a man named Jesus of Nazareth lived in Judea 2000+ years ago. Nor does it illuminate anything that man may have said or done. And the stories that we have about him are all second-hand interpretations and multiple linguistic translations of the legend that developed in his historical wake. So the Jesus in your mind, as he is based on those stories, is a legendary being. Like it or not, this is just a fact of reality. And "believing in" those legends with all your heart, mind and soul still doesn't change that.
I believe it's important for 'believers' to understand this to remain honest (humbly realistic) about what they believe vs. what they know to be so. Because their mental and spiritual health depends on maintaining that honesty.
Can't be done. Oh, it can be with the existence of Jesus, to some extent, but when you reach the limits of empiricism you run into real trouble on the question of God.
That isn't the question at hand.
You know, there really is something to be said for the pure utility of believing that justice is never escaped, that mercy is never beyond hope and that our existence is inherently meaningful in a way that transcends our individual understanding, but it's still inferior to the experience of God. Better than the alternative, mind you, but a lesser choice if that's as far as it goes with a soul.
You, not being the yardstick by which all other human experience should be judged, don't really have any means of determining that.
I have experienced all three of these "phenomena", and yet for me, the most valuable option is faith; not blind pretense, and not 'charismania'. They have their place, as life-tools go, but I have found that faith is the more useful, by a large margin.
But that's just me.
The question isn't do they define but do they reflect.
All religions "reflect" the reality of God, just as that idea of Jesus living in your mind, "reflects Christ", through you. Realizing the truth of this is partly why I'm a Christian.
Perhaps not to you and that's your business, but it's a mistaken statement in terms of Christendom. What he did on the cross was the most singularly important thing in the history of man since his creation.
Maybe, whether it actually happened or not. I'm hoping so.