> If I was going to be disparaging, I'd say that their closest Christian analogue is the nakedly revisionist evangelical Christianity of the the American 1970s and forwards.

I think the current strain, as far as Biblical interpretation is concerned, goes back to Darby's crappy-but-popular 1909 Bible, incorporating extensive same-page notes from Darby:

https://en.wikipedia.org/wiki/Scofield_Reference_Bible

The 70s are just when the GOP's plan to sell itself to evangelicals, on social issues, as a deliberate ploy to capture them as a constituency to support the rest of the GOP agenda, really started to take off.