I agree with undercover....
But my initial reaction is: why is a JW posting on MySpace? Assuming that he's willing to debate the issues, he is treading on thin ice as far as following the Society's counsel.
You can't win any argument with a faithful JW...cognitive dissonance will kick in and they'll never see any other viewpoint. I'd just have some fun with him and use the same tool that the Society uses; guilt. Mess with his head and make him feel guilty for going against the counsel of the Slave.
Some are such Die Hard Jdubs that they do not or will not think anything else. They will not allow you to explain things to them nor or they open to research their own religion. They have been supressed to beleive only the FDS.
Quirky1