I hope you're not done reading our comments, as I'd like to add my two cents. This sound a little harsh, but it's wake up time... What would you do if your wife wanted them to become Moonies? Scientologists? Branch Davidians? People's Temple? Would you even ASK the question about whether or not to help them get dressed for a cult meeting? An indoctrination meeting? I think you need to take a hard look at what the consequences of your decision is going to be. As another poster pointed out, your three year old is being indoctrinated now to view you and your advice to them (all of their lives) as tools and instruments of Satan.
I sincerely have never understood how people so often choose their spouses over their children. The Watchtower Society mentally abuses children, and if this were physical abuse, ask yourself what you would do.
Let me give an EXTREME example. (I am not comparing this as apples to apples, so don't be offended. I merely use something extreme to drive the idea across.) Yesterday I read in the news about a father "waterboarding" his eleven year old daughter. His wife watched. Both have been arrested. No, she didn't participate, but she permitted it, because she took no action to prevent it! And of course, she deserves to have her children removed from her care because she has failed to protect them.
Your wife isn't waterboarding anyone, of course, but the point is, if you know that something is dangerous to your kids, will you protect them, or will you choose your mate?