Dr. Greg Bahnsen has written many notable books on Presuppositional Apologetics and has also debated many atheists on the “objective truth of Christian theism” – atheists such as Edwin Tabash, George Smith, Gordon Stein, and Michael Martin .
I myself am not a presuppositionalist, but I always find in some circumstances the method to be meritous in terms of personal evangelism. This lecture should be given a proper and considerate ear on the discussion of presuppositions.
-  Although, Dr. Bahnsen and Michael Martin didn’t really debate. According Michael Butler’s lecture on Michael Martin, he comments that the two were supposed to debate somewhere in Tennessee, when all of a sudden there was some issues with taping and Martin backed out of the debate. However, Bahnsen showed up anyways and gave a lecture entitled Michael Martin Under a Microscope, analyzing and examining the works of Martin. This lecture is available for mp3 at http://www.cmfnow.com.