The “Judeo-Christian tradition” was one of 20th-century America’s greatest political inventions. An ecumenical marketing meme for combatting godless communism, the catchphrase long did the work of animating American conservatives in the Cold War battle. For a brief time, canny liberals also embraced the phrase as a rhetorical pathway of inclusion into postwar American democracy for Jews, Catholics, and Black Americans. In a world divided by totalitarianism abroad and racial segregation at home, the notion of a shared American religious heritage promised racial healing and national unity.