BEIRUT (Reuters) - Conflict in Syria kills hundreds of thousands of people and spreads unrest across the Middle East. Iranian forces battle anti-Shi'ite fighters in Damascus, and the region braces for an ultimate showdown. If the scenario sounds familiar to an anxious world watching Syria's devastating civil war, it resonates even more with Sunni and Shi'ite fighters on the frontlines - who believe it was all foretold in 7th Century prophecies. From the first outbreak of the crisis in the southern city of Deraa to apocalyptic forecasts of a Middle East soaked in blood, many combatants on both sides of...