From The New Yorker, a never-truer headline and its subtext:
"How Christian Is Christian Nationalism?
"Many Americans who advocate it have little interest in religion and an aversion to American culture as it currently exists."
This equates with the 1950 study of hyperpatriotic nationalists who have little interest in the nation's welfare and possess a certifiable aversion to American government, the very government they simultaneously claim to uphold as the world's greatest.
We can call both the paradox of fanaticism, extremism, and the foulest sort of insincerity.