Former fundamentalist 'debunks' Bible
Ehrman clearly has an axe to grind. And his is self-admittedly the Problem of Evil in the world. This finds its way into his writing. Other equally credentialed New Testament Scholars are not convinced by his arguments; in fact they see the NT as highly reliable historically. Bart Erhman makes a living by overstating the implications of issues biblical scholars (conservative, moderate, or liberal) have known about for decades. See for example our previous post on this issue here when Bart was on the Colbert Report.
Ben Witherington has responded with a six part review of Bart's claims in Jesus Interrupted (Bart Interrupted)
part 1 part 2 part 3 part 4 part 5 part 6
For a wonderful book exploring these claims in accessible fashion, see Reinventing Jesus by Dan Wallace, Ed Komoszewski, and M. James Sawyer.