When southerners, especially politicians refer to “Christian’s”, are they including Catholics and Orthodox?

Like when you hear a southern congressman talking about “Christian Value’s”, “American as a Christian Nation”, and the sort. Or is “Christian” in the south used to refer to just all of the Protestant sects common there without having to name them all?

Edit: Just for context here:

I’m asking as a Catholic from Massachusetts who hears Southern Politicians (only in the media) talk about “Christian Values” that seem pretty misaligned with the Catholic values I was taught