Geez, I so know your feelings, PunkOfNice, and all the regrets from living a life of someone else's delusion, which became even their enforced delusion.
It hurts. And it sucks. But today the sun is shining and the snow is melting and the birds are singing happily -- I know it sounds corny, but sometimes it really is the small things.
Whatever happens with your son, he is his own person and adult. All you can do is support him and be there for him. And hopefully the balances in the universe will make it all right for him... and that the justice balance will be in his favour. I don't know what to think about god anymore, so right now things are all about "universal balance" for me. Those thoughts may change as I continue this journey from the cult.