Can Christianity survive, in the face of persecution and conflict, in the region of its birth? The BBC's Jane Corbin travelled across the Middle East - through Iraq and Syria - to investigate the plight of Christians, as hundreds of thousands flee Islamic militancy in the region.As I climbed the steep mountain path above the plain of Nineveh, Iraq, the sound of monks chanting and the smell of incense drifted out of the 4th Century monastery of St Matthew. Once, 7,000 monks worshipped here when Christianity was the official religion of the Roman empire. Almost the whole population was Christian...