True enough BluesBro but if they can get any evidence of things like celebrating birthdays or Christmas then you are toast regardless of how privately these things are done. If you have any conversations about creation, the flood, prophecy, 607 etc., no matter how vague and non confrontational, then you run the risk of being shopped and having to face the loyalty question.
I think it is possible to have conversations when you are still trusted but once you fade then any such conversations are far more likely to trigger the aposate response in a dub.
I would agree however that if you quietly fade and don't rock the boat then there is a reasonable chance you will be left alone. Until they think they have something on you that is....