I have long looked for a definition of antisemitism that could help me explain to Christian’s why this targeted hatred of Jewish people is a spiritual battle that’s playing out in real time right before our eyes. I finally found it in the words of Israeli journalist Haviv Rettig Gur, who captures antisemitism with rare clarity. He argues that antisemitism is “an ancient idea that recurs throughout history—the archetype that Jews stand in the way of the redemption of the world.”...