Ris-Orangis, France -- Flanked by a Baptist church and a Muslim cultural center, the slate-gray synagogue in this Paris suburb is a fragile beacon of religious tolerance. A poster hangs outside, announcing an interfaith concert. The unofficial headquarters of a 2-year-old Jewish-Muslim friendship association is located inside. But among Jews in Ris-Orangis and elsewhere in France, tolerance is a scarce commodity these days. Ever since a 23-year-old Jew named Ilan Halimi was dumped -- stabbed, handcuffed, naked and dying -- near a railway line outside Paris on Feb. 13, many Jews say anti-Semitism is resurging in France. "The Jewish community...