That is tough, Jbrown, and not an unfamilar story.
Here's a quote from a recent Watchtower article that gives you some idea on how non-JW's are viewed by the society:
"...And while we have not all suffered direct persecution, all true Christians have to struggle against Satan the Devil and the spirit that he engenders among mankind. (Ephesians 2:2;6:12) It takes constant vigilance not to be influenced by that spirit, since we encounter it at work, at school, and in any other place where we have to rub shoulders with those who have no interest in pure worship." WT September 1, 2005, page 13, para 2
Keep reading up on the Jehovah's Witnesses, get yourself informed, and keep asking your son questions. Here's my thread for newbies.