I was raised in the organization. I had doubts growing up, but in my 20's, I decided that the WTS was probably right, and that the reasons for my doubts were that the local "brothers" didn't fully get what the WTS was trying to tell us. I thought that the closer I got to the center of the org, the more sense it would all make. So I made an all-out effort. Ironically, the closer I got to the center, the less sense it made. Once I couldn't believe in the leaders anymore, I couldn't follow them. So I left. I have learned a lot since then that has reinforced my descision. I didn't come to this site or any other like it for about 4 1/2 years after the last meeting I attended, if I recall correctly.
I am not disfellowshipped, I am a "fader" (just faded away). But I think it is pretty obvious that I don't believe in it anymore. I never go to meetings, not even the memorial. And worse, I have a beard! I STILL can't figure out what the big deal is about that, but it is a no-no with them.
At this point, I just don't see how they can view themselves as the only channel of communication with God. I can't see why God would choose an organization that has mislead its people for over 100 years, telling them "the end" is "right around the corner". I can't see why Jesus would smile with favor on an organization that has basically built the modern version of the religion he was trying to get rid of.