Nearly a decade ago, many of us watched in shock as Donald Trump was elected president of the United States. Until that point, it was easy to write off his presidential run as an egotistical attempt to gain fame and power, with circumstances aligned to allow him to win the Republican nomination. But his victory meant that there was a real audience not disturbed by his bravado, sexism, and race-baiting. Academics like me were eager to understand what happened to the country. Into this breach came the concept of Christian nationalism. Given that an estimated 81 percent of white conservative Christians voted for Trump, it was easy to envision them as the main culprits behind his rise. Several academics (notably Sam Perry, Andrew Whitehead, Philip Gorski, Paul A. Djupe, and Joseph Baker) wrote articles and books on this subject, and as media attention followed, the notion of Christian nationalism quickly caught on among the public.