Here is what I think works best with Jehovah's Witnesses.
1.Most people assume certain fundamental "truths" about God, religion and the Bible which JW's are able to debunk.
2.Disillusioned by the JW's ability to debunk a rock-solid belief in their own world view, the neophyte becomes vulnerable to
whatever else the JW tells them.
3.A healthy skepticism invigorates a desire to learn. By becoming skeptical of everything they had always been taught about God, religion and the Bible the neophyte plunges into an indoctrination program that erases previous beliefs and substitutes the rhetoric and propaganda of JW -dom.
4.The new person at the Kingdom Hall learns to bond with the insular social system of JW's and exclude everybody and everything ELSE.
5.By insultation themselves from ALL OTHER FORMS OF INFORMATION the new JW becomes a religious clone whose sole purpose is to create new clones.
Is this being gullible?
The first stage debunking is a valuable service provided by JW's!
The horrible second stage is the atrocity to human intelligence.
It is like knocking somebody senseless and then taking them wherever you decide to take them.
JW's destroy the foundation on which people's lives have been erroneously built (false belief systems). They substitute another false system in its place.
It is not gullible to change your world view from strong belief to disbelief. It is gullible, however, to abandon one set of beliefs without a cooling off period and re-education program before embracing a new set of beliefs.