Richard Curtis might have dismissed the Christmas scene as impossible because it was so picture-perfect. In the grounds of a stately home in rural Oxfordshire, a stunning Norman church can be found. On a cold, crisp Sunday evening, flares light the way, and a Bach fugue escaping from the church serves as a soundtrack.We joined the small congregation of villagers for the Christmas carol service, and as the service drew to a close, I turned to see my partner, a proud Jew and the daughter of a rabbi, enthusiastically joining in with the chorus of "Oh Come All Ye Faithful":...