I thought I did, but in retrospect, there were things I questioned. Not so much the big doctrinal stuff, because I could always find some scriptural explanation that made sense (even if it was pulling verses out of context). It was the stuff that had no real explanation - like not celebrating birthdays, or women not wearing pants, or no beards. I guess I didn't really believe in disfellowshipping, either, because I ignored the rules plenty of times.
I was raised that way, which explains why many of us were pretty much brainwashed. You cannot fault a child for believing in how their parents bring them up, its normal.
it's only now that I'm out and have gone to university that I understand the power of critical thinking. It's what really liberates us. JW children are not brought up to be free, independent thinkers. Their natural child's curiosity is squashed out of them.