Thus, it is proven that the Jesus of the Gospel of Mark is someone who "never existed". That is something that can be proven. That Jesus is not based on the life of any real-world Jesus. And it can be proven that every other story about Jesus is derived from the Gospel of Mark. Thus we can prove that all "Gospel Jesuses" are really just fictional characters and that nothing about the Jesus of the Gospels is based on anything real. None of the events described in the Gospels really happened, and none of the teaching relayed as coming from Jesus really came from a person called Jesus.