Here is his conclusion:
In other words, Ehrman’s book is important to Americans only insofar as it can be taken to support the tenets of Christianity. Since it doesn’t, even by Ehrman’s admission, I’m a bit baffled at the attention it gets. I conclude that all the kerfuffle rests on this: Christians conflate the existence of a historical Jesus with the existence of a divine Jesus.
And, of course, there are important questions about how one adjudicates ancient history.