Jesus the historical figure? Sure, I can prove he doesn't presently exist as a living person. When was he born? 2000 years ago or so? The maximum level for human lifespan is well below 200 years, let alone 2000 years.
It boils down to this, in a nutshell. For Christians, Jesus is the great "I Am." In other words, Yahweh.
Okay, I've heard this argument before, about the "the square" YHEW. I'm no linguist for sure. But let me ask you, what did the God of the Bible tell us his name was? I think you need to go back to your research. You just said that Yehweh means I AM. But this is incorect... the meaning of Yehweh is well disputed, but most think it means: "He Brings Into Existence Whatever Exists"
What your thinking of is: Ehyeh asher Ehyeh the name God gave himself in the burning bush. Which is translated I AM that I AM
and that's all that I yam.
As far as you empirical (things we can observe) argument on Jesus. Can you go on to prove that math ceases to exist when we die, or when the world blows up or when the universe and all matter ceases to exist. Dose math still exist?