Jehovah's Witnesses use the threat of death to enforce obedience to their organisation. Disobedience often leads to expulsion and the threat that the disobedient one will be killed by God at Armageddon if he is still disfellowshipped at that time. In the meantime, the person faces a kind of spiritual and social death as he is denied association with his believing family and former friends.
This enforced obedience includes believing everything that is currently taught by the governing body of Jehovah's Witnesses. It makes little difference that their teachings keep changing. They must be accepted until they are changed and then the new teaching must be accepted immediately.
The new blog Death or Obedience explores this subject and asks the question of whether the unique teachings of Jehovah's Witnesses conform to the Bible, logic and reason. It also discusses the consequences when a member dares to question the official teachings of Jehovah's Witnesses.
This blog features a set of audio recordings of Jehovah's Witness elders as they offer "encouragement" to some members who have doubts. The first recording begins at this post. I hope you will check it out.