good Question.
I was raised as a witness,initially I believed everything.
Later, when my interest in science grew, I stopped believeing, that all animals will eat veggies in paradise, I had doubts about a worldwide Flood, and I thought the trumpets in Revelation were bogus.
I also anticipated a change in explaining the generation in the 90`s,
I always knew the Society got 1975 wrong, it was not the rank and file fault, as they tried to blame them.
But all this was not the real issue for me.
What started to wake me up were the inconsistences in their blood doctrine, because this meant life or death for people.