Notre-Dame: The Soul of France; by Agnès Poirier; One World Publications; 256 pp., $26.95 Kneeling in public remains rare in France. Even though Muslim crowds in the banlieues (suburbs) have recently taken to praying in the streets, religious display still shocks the country’s secular ethos, which prefers to severely confine religion to the private sphere.  So, when a motley lot of...