Exceptionally interesting, as Biblical scholar Ehrman, an agnostic, takes on the rabid atheists who claim that Jesus is obviously a fiction created by Paul, or someone, for purposes of...well, I'm not sure, you'll have to ask them. Ehrman takes on this trope, and some of the authors who have peddled it, ably. Questions of divinity aside, Jesus of Nazareth was a historical person who lived in the early years of the 1st century and suffered crucifiction under Pontius Pilate. The evidence for Jesus is just as good as it is for most personages of the time and better than many.
Rather amusing is how Ehrman ignores the question of the Resurrection. He points out that Paul, for example, knew people who knew Jesus - Peter and James the Righteous among them - but can't for the life of him bring up the fact that Paul, who preached the Resurrection, knew people (Peter and James) who'd actually witnessed the risen Jesus too. Funny how they always skitter around that one.