There are various interpretations of Trumpism on offer. Reading it as fascism explains its appeal to the white nationalists of the “alt-right.” Reading it as populism explains its appeal to a white working class fed up with the “Washington establishment.” And reading it as authoritarianism explains its appeal to voters with authoritarian personalities. These interpretations are not necessarily wrong, but they do not explain Trump’s appeal to evangelicals qua evangelicals.
So, let me propose a different interpretation. On this reading, Trumpism is a secular form of religious nationalism. By “religious nationalism,” I mean a form of nationalism that makes religious identity the litmus test of national belonging. By “a secular form of religious nationalism,” I mean one that strips religious identity of its ethical content and transcendental reference. In Trumpism, religion functions mainly as a marker of ethnicity.