Dr. Greg Bahnsen died in 1995, before then he was one of 20th century's greatest defenders of the Christian faith. I have read a number of his books and listened to countless hours of his lectures as well. The clip below is from a tremendous debate that took place between Dr. Bahnsen and Dr. Gordon Stein. It is worth every minute that it will cost you to listen to it.
You can listen to the whole debate by going to this LINK.