Look, it’s not about whether he’s an atheist or whatever. Bart Ehrman is an embarrassment to other atheist professors of biblical studies, Hebrew, Greek, etc. Every time a book of his comes out, the professorial blogs spend a long, exasperated time picking out all his mistakes – but what really offends them is the way his arguments are constructed.
For example, in one of his books, Ehrman has a long section on how Epiphanius (in his opinion) is a terrible, biased source on what various heretical sects believed and practiced. Ignore him! Don’t use him!
And then, he proceeds to quietly quote from Epiphanius, and reference information only found in Epiphanius, throughout the rest of the book.
Ehrman does this all the time, in all his books. He clearly thinks you can have your cake and eat it too.
The only reason he can play these games is that most ordinary readers are not familiar with the sources. Scholars who work with them all the time, or even hobbyists, find him dishonest. He discredits himself.
Don’t ever buy a used car from that man.