It's weird how the "Christian nationalism" meme has been pushed by the usual suspects when US church attendance is at an all-time low, and religious influence on politics is a shadow of its former self. My guess is it's a mixture of obsession with The Handmaid's Tale, and the need for an alternative pejorative term that can be applied to black and Hispanic conservatives.
Evangelicalism is now a meaningless term with the nyt even claiming it’s largely an identity that does not practice in any form. It’s just a default conservative term for whose who can’t admit they are atheists.