With all due respect, this is not reflective of the protestant revival movement in the US in the 1800s. The second awakening was absolutely a bunch of rival interpretations of the word claiming they were right b/c (insert reason here).
I probably should have been more specific in my original reply but when we’re taking about US “Catholics aren’t Christians” that’s 100 percent the origin of the trope. I can’t speak to the Irish version but I’d challenge anyone about it in the US. That’s why we needed an Ecumenism movement in the first place after all.