Since 1876, Jehovah's Witnesses have believed that they are living in the last days of the present world. Charles T. Russell, their founder, advised his followers that members of Christ's church would be raptured in 1878, and by 1914 Christ would destroy the nations and establish his kingdom on earth. The first prophecy was not fulfilled, but the outbreak of the First World War lent some credibility to the second. Ever since that time, Jehovah's Witnesses have been predicting that the world would end "shortly." Their numbers have grown to many millions in over two hundred countries. They...