I have proof that JC existed/exists. Two weeks ago, I was up on a ladder, installing a pulley in my garage roof for a new kayak. As I was drilling a hole, sawdust got in my eye, and I lost my balance and jumped off the ladder, yelling "Jesus ------- Christ!"
After I landed (on my feet) on the floor, the ladder tottered, then fell over.
If that is not proof of JC's existence, I don't know what is.