This subject interests me regarding the growth rates of religious groups, and success of the methods used. I have written on this subject many times. Here is one example.
https://www.jehovahs-witness.com/topic/5926017217593344/lds-statistics-extension-may-suggest-that-jws-could-bigger-more-engaged-membership
Although the census does show 3 other religious groups out preforming the JWs. What it doesn’t show are the activity rates and the depth of involvement by its members. Let’s make this clear, saying and doing are two different things. Btw take lds membership with a grain of salt.
However, the Mexican census does support a few things. The counting methods used by the JWs tends to underestimate rather than overestimate. Generally, census figures tend to be twice that of what WT reports. This would support that Wt is been honest with it’s counting. Interestingly, the memorial attendance is around 20million, which would account for those who aren’t really involved in the religion.
If you look at the above post. One could justifiably speculate that the jws could perhaps be bigger and more involved than the lds. This becomes even more impressive when you factor in that the lds had a 50 year head start on the JWs. By the the time CT Russel came along the mormons were established in Utah.
In my opinion, the religion to watch is the SDA. Eventually this religion will begin to dominate the JWs/lds. They may even well be doing it now.