ah after reading Verd's comments, i just want to reiterate..
that JWs are a sect of 19th Century Adventism...their body of beliefs falls squarely within adventist theology and even a lot of the cultural aspects are adventist. If it weren't for the fundamental difference regarding the diety of Christ and the trinity, they would probably be considered by all to be very similar to today's major adventist religions/strains which most acknowlege as a legitimate branch of Christianity.