The Watchtower Society openly acknowledges that constant doctrinal changes are causing many to abandon their religion.
Oh irony, you're always there for me!
[w75 6/1 Millions Have Left the Churches - Should You? p. 324]
WHY DO THEY LEAVE?
The reasons that people give for abandoning the churches are many and varied. Some in West Germany do it in order to be relieved of paying the church tax. More often, however, the reason involves changes in Roman Catholic teaching in recent years. These have confused many persons who thought that they had the true apostolic religion. As one Catholic priest in the United States put it: “If the things the Church has said in the last ten years are true, then everything it said for the last 2,000 years is false.”
The solution proposed by the Watchtower Society to anyone finding themselves in the type of religious organization described above continues in the same article:
...be sure to weigh carefully what God himself says in the Bible at 2 Corinthians 6:14-17: “Do not become unevenly yoked with unbelievers. For what fellowship do righteousness and lawlessness have? Or what sharing does light have with darkness? . . . ‘Therefore get out from among them, and separate yourselves,’ says Jehovah, ‘and quit touching the unclean thing.’”