As we begin a new year, I believe that what the world Jewish community is most lacking is size, and the foremost challenge confronting it is the need for greater numbers. The number of Jews in the world has fallen below a critical mass, and the paucity of our number leads to its own tragic consequences. Foremost among them is our inability to defend ourselves. Does Israel really have a long-term future with so few Jews in the world? Who will influence and exert pressure on their own governments to support Israel, the Middle East’s only democracy, when the Jewish...