A few years ago, Ergun had an e-mail debate with a Muslim by the name of Nadir Ahmed. Within this debate (if I can call it that), along with a list of other points, Ergun Caner stated that he wanted to discuss the following point:
"1. You pick any topic you wish, concerning why you do not believe in Jesus Christ as Messiah. E-mail your question to me here. "
If Ergun has not already removed the debate - you can read it here. If removed, you can read it here.
If Ergun has deleted it because of this exposure - you can see a screen shot below.