Ahh, but China and India were isolated. Palestine was the crossroads of the ancient world, where Europe/the Mediterranean, Africa, and Asia meet. Jesus was born not in some country backwater, as most imagine Bethlehem to be, but rather at the meeting point of nearly all the world's cultures, brought together by Greco-Roman trade. He couldn't have had such an enriched environment to be born into again, at least until the heights of the British empire. (And yes, Jerusalem was the world's 3rd largest city.)