there's, dammit, what do they call that, a constant?, something else that needs considering to the growth of jehovah's witnesses and that's 'no sex until marriage'.
which means jws get married a lot younger than the general public, many times in their teens. then they start pooping out future jw babies.
once married, the congregation puts a massive love bomb on the brother b/c he's now 'responsible', so he's coddled and given position and kept very busy.
so, family growth needs to be taken into consideration, and for the most part it's a passive decision, like for me, my dad said if i was old enough to get a driver's license i was old enough to get baptized. i read b/t those lines, no baptizm, no license. no license, no way to sneak out of the house to go see concerts and hang out with my friends who lived out of the area.
bam! baptized, and didn't leave for a good 10 years after that b/c by default the whole social network is in tact, yadda, yadda yadda.
so if kids born into it aren't counted, i think there would be a loss in most parts of the world.
solution: sex before marriage, with a condom, hey that was fun. sex with someone else. hey that was fun. leaves the whole mystery out of it and people will make better choices in those they marry and make better choices on whether to stay in a religion that's quite kooky.