When you ask if some one is a believer, I have to ask: Believer in what?
Belief is a very big subject. Do I believe in a God? Yes, although I prefer to keep my opinions to myself these days. Do I believe the Earth is flat? No. Do I believe the Watchtower? No. Do I believe in the scientific method? Yes.
So what are we talking about?
I think you need to define your question before we can talk about it. I've been out of the Watchtower since 1988, the one thing I've learned is that the world is rarely black and white, a good part of the time it isn't gray either, there's a whole rainbow out there.