http://www.newyorker.com/arts/critics/books/2012/03/05/120305crbo_books_gopnik?currentPage=all
Revelation, far from being meant as a hallucinatory prophecy, is actually a coded account of events that were happening at the time John was writing. It’s essentially a political cartoon about the crisis in the Jesus movement in the late first century, with Jerusalem fallen and the Temple destroyed and the Saviour, despite his promises, still not back. All the imagery of the rapt and the raptured and the rest that the “Left Behind” books have made a staple for fundamentalist Christians represents contemporary people and events, and was well understood in those terms by the original audience.
