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A very large number of them were brought up in that religion by parents who either became JWs themselves, or had been brought up as that. As for the converts gleaned from door-to-door visits etc, they are often people who are at a vulnerable point in their lives when along come the JWs promising a paradise Earth with no sickness and seeing dead ones resurrected - within a few years, if not months!
All of that was involved in my family, going back 3 generations. From one series of visits back in the early 1930s and the conversion of a couple who had just had their 5-year-old firstborn killed, came 16 JWs (though most of them stopped being JWs later in life.) That does not include all the JWs they converted on their door-to-door work, of course. The conversions come with simplistic answers to difficult questions, apparently from the Bible. But as almost all their converts are biblically illiterate to begin with, it's easy-peasy to convince them that JW teaching is unique and the only biblical truth around. The simplistic technique is to smear all of Christendom with muck then compare themselves as being whiter than the driven snow. "Jehovah must be blessing us - see how we are growing!" while trying to cover up the hundreds of thousands of disenchanted JWs who either slip out the back door or are brutally disfellowshipped and shunned.
But when the Holy Spirit deals with individuals, He first convicts them of their sin before a holy God, which causes them to cry out to God for forgiveness as they trust only in what Jesus did to be saved. Then the new-born Christian is helped by local Christians (denomination almost an irrelevance) to grow in understanding and in God's grace. It's not a head-trip, as with the JWs - it's a spiritual heart transplant and a new mind - the mind of Christ.