Came here to say this. I have assumed for at least the last 20 years that any Republican politician is a christian nationalist, and though I don't have specific figures, I think I've probably been correct 99% of the time.
That 1% is just due to caution -- I don't have anyone in mind.
They approach young first term republicans in DC, and shower them with attention and bribes/donations. To play ball, you almost have to deal with them. Because everyone else in your party already did, you'll never get preference over another member.
I think the bigger problem is that there are only two parties. Having the biggest party lead the house wouldn't be as big of an issue if they were still a minority of the total collection.
"Before arriving in Washington less than a decade ago, House Speaker Mike Johnson, a deeply religious Christian, was a legal crusader associated with a fringe evangelical movement called ‘young Earth creationism,’ based on a literal reading of the Bible’s Book of Genesis that posits the Earth is only several thousand years old,” the HuffPost reports.