Not all autistic people have panic attacks over changes, its one of those stereotypes that just has a lot of truth to it but, not always the case; kinda like all black people being lazy.
Is Rocky still in Chris's life? It's fun speculating on where Chris is going to end up but, the best thing for Chris would be Rocky talking him into a faith based group home exactly as you mentioned. A preacher man/pastor explaining to chris he's not a god and he should thank the true Abrahamic god daily for his food and shelter and the whole "blasphemy" conversation is going to be like explaining to a child with a criminal record there is no Santa Claus, might be tears and some bloodshed. OR he just he just keeps on refusing to belive in reality, as long as he doesn't screw up too bad I would hope they wouldn't kick him out of a place setup for people of mental capacity like him.
Incidentally, Merry Christmas too anyone reading this, I'm thankful for not being Chris Chan. I'm thankful for My Family I Love, my Girl who is always DTF, my job I love, my home I purchased with my own honor blood and sweat and the pride of being a truly self made man.