@giujohn,
Well, you begin with amanifestly false assertion "There is NO corroborating written evidence of is (sic) existence.
Are not 4 separate testimonies to his life. As found in 4 separate gospels, written as biographical and in historical context corroborating? Not to mention the fact that the early Christians busied themselves with quoting from those gospels, and copying them to such an extent that there are thousands of complete and fragmentary witness in museums and collections around the world to this day.
And then we have testimony from sources outside the early Christian community, such as Josephus, Thallos, Pliny the Younger, Seutonius, Tacitus, Mara bar Serapion, Lucien of Samosata, Celsus, the Rabbinic tradition and the Toledot Yeshu. Some of these are neutral; some are downright hostile, but they all attest to Jesus' existence. There's more corroborating testimony to Jesus' existence than that of most other historical figures of the time to the extent that few scholars pro or con are willing to make the charge that his existence is even doubtful.
I addressed his claim to be God elsewhere in this post.
According to the evangelists, Jesus knew that he would be known throughout history, and that humans would do both good and evil in his name.
And what have we? We have both good and evil done in the name of Jesus. We have hospitals and relief work done, as well as hate mongering and even murder committed in Jesus' name. Clearly there's something to that.