One word-cult. Two words-mind control. Most witnesses feel contradictions in what they are taught, but they are very good at stuffing them away (cognitive dissonance).
Once they get a person to believe that they can live forever on a paradise earth if they follow the Bible's (gov. body's) guidelines, they are hooked. Thoughts surface that they don't really agree with certain teachings, but they go along to make sure they get to that paradise.
It is when the they run out of room to stuff their objections that they wake up. That is why I think a person has to be ready to wake up. You can tell them things that don't make sense about their religion, but if they can't let loose of that paradise hope, they will continue to stuff away.
A well placed thought, on occasion, can speed up the process, but you can't force anyone to give up their cherished hopes.