Interesting question. In my case I held beliefs in evolution for a couple for years before I was difellowshipped. One thing I am not is a hypocrite I just couldnt live the lie any longer, eventually the belief manifested itself in many ways. They turfed me and seperated me from my familly and extended familly on both sides.
Truth is a very dangerous thing to the witnesses. I would guess that maybe 10% of the dubs are the true ones who would'nt say shit if they had a mouthfull of it. The rest are just a bunch of frightened spies amongst thier own people.