In answer to the O.P question, it is difficult for me to estimate the percentage I actually believed at any one time during my nearly six decades in the Cult.
As a born-in, I suppose when I was very young, as it was coming mainly from my parents I accepted it all as true, what they were saying, and probably most of what was being spouted at the Meetings.
By the time I was 9 or 10 I was asking my father awkward questions, one I remember distinctly was when we began to study the green Daniel book in the late 1950's ( the Title escapes me) I was very aware that the interpretations were considerably changed for what had been taught formerly, based on Rutherford's stuff I guess, and I asked how could this be ? and how would the old faithful JW's take these changes ? the old man told me that probably the old ones didn't have a good memory for what had gone before, so would not be upset, and that this book was " new understanding". I did not argue.
By the time I was in my late teens I had decided the "fulfillment" of great Bible prophecies by a few of Rutherford and gang lurking in the trees at Cedar Point Ohio for a Convention was utter rubbish, and from that point on began to question all the W.T teaching to some degree.
I not only questioned the Bible interpretations, but also much of the rigid Rule Making, and often openly flouted the Rules.
With this attitude I got a bad reputation in my Congregation. When I got married, my wife and I decided we were going to make a go of being Witnesses, and that I would not be too much of a pain in our new Congregation, but I was till a questioner and a rebel. I did fit in well at my new Congregation, full of fellow questioners and rebels, this served, sadly, to make me feel comfortable with sticking to the religion despite my misgivings, I say sadly, because had I been in a different Congregation, Rule bound and run by Nazi Elders say, I would have left decades before I did, no doubt.
By the end, I did not believe most of it, and when I learned for sure that the 1914 Doctrine was shite, I left.
