Each person has to do what they feel is right for them.
For me, I just walked away. The congregation deserves no explanation from me. No one has asked for an explanation, I don't think they WANT to know. It has been two years since I abrubtly stopped attending meetings and going in service. Very little acknowlegement from them. Most of the do shun me, other's do not. 3 very brief, very generic calls from elders, no visits. They never gave a crap about me, why should I give them any of my time or effort?
You do what feels right to you and you will be OK. I know a part of you wants to save them from this cult. If you think it will help, do what your heart tells you to do.
Best wishes to you and I personally am happy to hear of you and others breaking free. Others will follow, others will follow.