Jehovah Witnesses are a Christian denomination with many beliefs that differ from mainstream Christianity. One of the things that Jehovah Witnesses forbid is blood transfusions. They believe that the Bible prohibits the ingestion of blood and they consider it to be a form of cannibalism. This belief has led to some members of the faith dying because they refused necessary medical treatment. Another thing that Jehovah Witnesses forbid is celebrating holidays like Christmas and Easter. They believe that these holidays have pagan origins and are not based on scripture. Additionally, Jehovah Witnesses do not participate in politics or vote because they believe that earthly governments are controlled by Satan.