However, I doubt it will have any effect on Christianity.
Or, do you think it will?
It seems to me the two strongest arguments in favor of an historical Jesus are
1. By the criterion of embarrassment, in all four gospels, Jesus is shown as aggressive towards his mother and his family: Mark 3:31-35, Mark 6:4-5, Matthew 10:35-37, Luke 11:27. John 2:3, contrast only John 19:26.
2. Ehrman's point that at no stage did any enemy of the early Christians use the argument that Jesus didn't exist.
But overall, no one can decisively demonstrate the existence in 1st century Galilee and Judea of a real human who's known to us as Jesus. Such a figure is not necessary to explain the gospels, for example.
And no one can decisively demonstrate that no real human was the founder or trigger of Christianity.
Which said, if we assume there had indeed been an historical Jesus then the only credible model for him in the NT is the Jesus of Mark.
As for his message, there have been various claims that particular sayings found in extracanonical gospels are authentic, but as the failure of the Jesus Seminar shows, that's all
mere opinion.
And if Mark is indeed any guide, such a Jesus may have been a follower of John the Baptist, with no greater subtlety of thought than "Get Ready ─ God's Kingdom will be established on Earth in the lifetime of this present generation."