Ehrman's error

Bart Ehrman is a New Testament textual critic who used to be a professing Christian but is now an agnostic and writes books that seek to cast doubt on the reliability of Scripture, but his arguments are self-contradictory.

It's all Greek to me!

I have just listened to Bart Ehrman in a discussion with Darryl Bock on the Unbelievable? radio show.  Ehrman was arguing that Peter didn't write the letters ascribed to him because he wouldn't have known Greek and even if he did, he couldn't have written a literary document in that language.