Notre Dame kept Christmas going even during two world wars — a beacon of hope amid the bloodshed. As the lights stay dim in the once-invincible 855-year-old Paris landmark, officials are trying hard to focus on the immediate task of keeping burnt-out Notre Dame’s spirit alive in exile through service, song and prayer. It has decamped its rector, famed statue, liturgy and Christmas celebrations to a new temporary home pending the restoration works, just under a mile away, at another Gothic church in Paris called Saint-Germain l’Auxerrois.