The truth according to Bart D. Ehrman

[John V]

Am I?

Yes. You're defending a poor position when it would be simple to retract or restate.

So it's reasonable for someone to make a thread critical of an author's work, having not read it,

Yes, if the proper disclaimer is made, which it was.

and ask someone else to summarize said author's arguments?

Sure. It's a discussion forum, after all.

When said author's bibiography consists of approximately two dozen lengthy, scholarly books?

That gives you plenty of arguments to choose from. No one demanded that all his works be summarized. I would think you'd start with the one or two arguments which you find most compelling.