Toby.....I feel for you in your situation and can totally relate to the sickening feeling inside...both upon realization that you've been duped all these years(OMG! It can't be true, can it?!) and the fear of losing your son. My son, now 27, was in trouble more with kids from the KH then ever with any worldly associates....as other posts have pointed out, just being "in the truth" is no guarantee that all be well for him! There was a period of time when he did head on into the drug world, but it wasn't until he was trying to clear his conscience of what he'd been doing with his buddies from the KH and went to the bros and they DF him...admitting to me and him both that he WAS repentent, but thought he needed a lesson! So, I stayed close by, he went and tried everything in the world he'd been warned against, we kept in touch always, I never shunned him....3 years later he moved home when he'd gotten injured on a job and couldnt work and began going to the meetings again. He said he always felt different than everyone during those years out in the world....girls especially told him he wasn't like the other guys they knew. It was different in a GOOD way.... and I would suspect your son would find it the same for him. Our kids ARE raised different in JW, and its not all bad....my son has always been very social, he's not an oddball kid or a geek....he would fit in anywhere and has a keen mind. I'm convinced that he will see through all this religious stuff in his own time.
I would suggest that you try to keep the lines of communication open between you. You don't mention where your wife is in all this....what is she thinking? Are you talking to her....is your son? I think if you want to create the least disturbance in your life and those around you then I'd try the slow fade(which IS what I'm trying myself!)....it calls for lots of patience and endurance and learning how to be VERY VAGUE when talking to friends from the KH, but patience and endurance are good qualities we're supposed to be cultivating anyway, right??
Hang in there, Toby....we're all here for you...keep us updated on how its going. LOVE your son, no matter what! This will be difficult for you all, but if you can get them all out then that will be worth it...that's my goal with my family too. A fellow traveler, bythesea