"Jesus existed as much as [fill in the blank] existed" is where I have to leave historiography and turn to science.
Extraordinary claims require extraordinary evidence, said Carl Sagan. There's no more extraordinary claim in European-based culture than that of the divinity of Jesus.
I've never read any argument in favor of the existence of the man except "other people might not have existed either."
And, since "Jesus existed" is a convenient back door to "Jesus is Lord," the idea that he existed at all merits greater skepticism than does the same assumption about other ancient figures.