Greetings GT,
I sure do not know if your wife is like my parents (real "Society folks"), but just in case, please allow me to offer an idea. My parents are not confident people. They assume that most others are smarter and more capable than they are; hence the leaning on the WTS to tell them what to believe. Your wife very well may believe that the guys in Brooklyn are much smarter than she is, and closer to God as well. Therefore, what they say is gospel in her view.
My own wife has been a bit that way, but she has come a long way toward gaining confidence. One of the things that has helped her to assert herself and to rely on her own opinion has been the constant praise I have directed her way. She genuinely is smart and I relentlessly tell her so. It has taken years, but she now is even aggressive at times in sticking to her opinion about a matter.
If your children are very smart, as you state, chances are that she is smart too (even if much of the kids smarts came from you). Keep reminding her that she is smart and that she can "see" for herself the hypocrisy of the WTS joining the UN when you and I cannot join the YMCA. I would not try to undermine all of her confidence in the WTS yet, but if she could admit ? even if just to herself ? one bit of uncertainty about their credibility, more might follow later.
One more thought; if you buy into the idea above, it might be best to begin the praise in other areas, not the WTS stuff. Otherwise, she will see your tactics as a transparent ploy to turn her against the WTS. Maybe your relationship is too far gone for this tactic. I offer it for what it is worth.
Best wishes for your future and that of your children. If you could save your wife from life long worship of the WTS, that would be great too.
Sam