SEVRAN, France — Jérémy Bismuth is Jewish, though he doesn't wear a yarmulke or Star of David pendant or adhere to a Kosher diet or leave school early on Fridays to be home before sunset. Nothing identifies the 15-year-old French boy as Jewish except his birth. Yet because he is a Jew, he was attacked by a group of other children, mostly Muslim, at the private Catholic school he then attended. They dragged him into the school's locker room showers shouting that they were going to gas him as the Nazis had gassed Jews. He was beaten and flogged with...