Evaluate your choices carefully with out emotion if you can. What would be the best at getting most if not all of your family out. Go back to meeting and then once looking spiritual again teach your children from the bible the teachings of christ slowly showing your kids the hypocrisy of the borg. Or staying how it is and getting aggressive with teaching and showing your kids whats wrong with the borg, this will probably be much harder especially if they have friends in the hall and its thier whole social world. Plus they see it as pleasing god. Or option 3 leave your wife possibly take kids with you or atleast fight for joint custody.
Im in a similar situation and should have never left. I should of staid and then showed my kids through weekly family worship whats wrong with the Borg. I have since become an athiest and tipped to much of my opinion out there while talking with my oldest son, so i dont think i can go back. This religion become thier whole social and spiritual life and you are fighting against a whole machine with millions of people apart of it. So fighting it is a huge battle.
I personally see that in my case if could save my kids but loose my wife i would take that trade. Right now im loosing all my little battles. The kids see no down side in being in the cult and its thier social world for the most part so they dont want to leave it. You have to pick a plan and go with it long term and along the way maybe even change plans. Theres no easy way and no plan that works perfectly for everyone.