Many years ago, when I was trying to get my first airline job, I took the test and joined Mensa because I thought it would differentiate my application and perhaps get me an interview. I'm no brainiac. I've just read books on various topics over the years and apparently have a fairly good memory and know how to take tests well. I only went to two or three meetings before I decided it wasn't my cup of tea. Most of the members in my area really were the nerdy absent-minded professor type and I found it hard to follow some of their conversations.
Pretty soon thereafter, a career counselor warned me that some airlines might view being in Mensa as a negative. That's because the stereotypical Mensa member often finds it hard to accept the monotony and routine that is the reality of most airline flying. They tend to develop personal shortcuts and develop "better ways" of doing things on their own. That may be fine in academia or research, but it can be disastrous in aviation. Since airline pilots are pretty much interchangeable with any other company pilot assigned the same seat in the same type aircraft, it is essential that each one follows the same procedure the same way every time. Each pilot must know what to expect from any other pilot in a given situation. Extremely highly intelligent people tend to have trouble adapting to the highly structured, thoroughly regimented and procedure-oriented aspects of the job and the long stretches of monotony that airline flying involves.
Anyway, I dropped any mention of Mensa in my airline applications and eventually got hired. I've been flying commercially now for over 30 years.
As for the ex-JW aspect, I never mentioned my flirtation with Mensa to anyone other than family, but I've been told several times that I'm "too smart for [my] own good." Whatever that means. I think it was just a way to avoid answering my questions that challenged the way they were told to think. I came to realize that I couldn't in good conscience teach others things I didn't believe myself, so I just quit, pretty much cold-turkey.