Myths can be innocuous enough, providing pleasure and comfort to believers, for instance, the Jesus birth stories that are celebrated at Christmas or the legends of Abraham and Moses conveying God’s promised land to the Israelites.
But myths can have a darker side when they are embraced as religious or ideological truths. A millennium ago, Christian Crusaders slaughtered tens of thousands of Muslims to secure the Holy Land for Christian pilgrims, and even today many Israeli Jews resist compromises for peace because of the legends contained in the Torah, or Old Testament.
Other Judeo-Christian myths have contributed to horrendous bloodshed. The crucifixion story in one gospel – that of John – shifted blame for the killing of Jesus from the Romans to his fellow Jews, contributing to centuries of vicious anti-Semitism culminating in the Holocaust. Most likely, John’s story reflected a religious rivalry between early Christians and Jews and was a bid to appease the Romans by lessening their role.
Similarly, over the past century, Zionists who advocated a Jewish homeland in ancient Israel exploited the myth of the Diaspora, the supposed Roman dispersal of Jews from the Holy Land to be scattered throughout Europe. The Diaspora justified the return of European Jews to their “original” home, thus correcting a historical injustice.
However, research by Israeli historian Shlomo Sand and others indicates that the Diaspora never happened, that the vast majority of European Jews originated from the religious conversion of large tribes in Eastern Europe and Northern Africa more than a millennium ago, not from some mass exodus organized by the Romans after Jewish uprisings almost two millennia ago.
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http://www.consortiumnews.com/2009/122109.html