THE END OF THE WORLD

The central doctrine of Christianity is the teaching that Jesus rose from the dead, thereby proving his divinity and his role as the Christ (cristos. the annointed one, a title which as Messiah indicated that he was to be seen as the promised leader who would free Israel from oppression).  When the Romans destroyed Jerusalem in 70 CE, Jews who lived elsewhere (and at the time of Jesus there were Jewish communities throughout the Roman world) came to live for the day when the Messiah would arrive and rebuild the Temple.  For those Jews who had come to accept Jesus as the promised Messiah--the first Christians, then--the period that they had lived through came to be seen as the time of an anti-Christ, and tn the Book of Revelation attrributed to the apostle John there is the fascinating pun that equates the numerical equivalents of the Hebrew letters for the name of the Emperor Nero (six hundred sixty-six) with the Greek letters that, also treated as numbers, expressed "the great beast."  (Today, with our Arabic numerals we have "666" but do keep in mind that in that period this nicely symmetrical arrarangement of digits was not yet possible.)  A "second coming" of Christ was seen as imminent, and connected with this is is the idea that the dead would be brought back to life--resurrected, even as Jesus had been--and brought to judgment.

At the time of Jesus the idea of personal immortality was not yet universally accepted, but for those who did accept it the idea definitely was that "eternal life" was not just survival of a soul but a restoration of both soul and body and the promise of a renewed physical existence that corresponded to the life of the legendary Adam and Eve in Eden. Christians accepted it as part of their official doctrine in the Nicene Creed, and the Jewish teacher Maimonides in the Middle Ages made it one of the thirteen key precepts of Judaism.  Islam also accepted it and, interestingly enough, sees Jesus as returning to earth in order to lead a mass conversion to the teachiings of the Qur'an.

All three traditions have long since embellished the central idea of a period of conflict followed by an unending era of heaven on earth, and in each there have been fringe movements that have concentrated on the idea that the end of the world (as we know it) is during the lifetime of its members.  Inevitably any of these movements (examples would be the Lubavticher groups in Judaism, Seventh Day Adventists and Jehovah's Witnesses in Christianity, the Ahmadiyya cult in Islam) call for their members in effect to segregate themselves from the corrupting influence of a world already seen as under the control of the powers of darkness. 

The general discussion of how the world we know is supposed to end is known as eschatology, and most of the literature deals with Christian outlooks, especially as this has come to be popularized in books such as the Left Behind series by Tim LaHaye and Jerry Jenkins.  There are several points that I would like to note in particular.
--Normally mainline denominations--Jewish, Christian, or Muslim--do not insist on the end of the world being predictable, much less imminent.  Instead there is simply a general belief in a resurrection of the body connected with a time of judgment and a future world that will be heaven for some and hell for others.
--Groups, especially Christian ones, that do emphasize the end of the world also insist more strongly on the role of individual prophecies as well as on interpretations that attempt to fit current events into scriptural prophecies.
--Groups such as these may well influence political events.  In the United States there is considerable discussion about the role of such beliefs in determining foreign policy since 2000. 
--While more readily apparent in the Abrahamic traditions, there are still parallels in Asian religious history, as in the Yellow Turban movement in ancient China.  Dissatisfaction with a present era and the belief in a utopian future, usually to be achieved through violence under the leadership of a charistmatic leader, is an indicator that we need to understand that religious beliefs can sometimes have a negative impact on society.  The Gospel saying "I have not come to bring peace but a sword" should be a reminder of this.