Interesting article. I am religious but have to admit that the history of religion involves many distinctions that are mistakenly imbued with great importance.
My mother worked in the Pentagon in WWII. A coworker told her that she was the first Catholic she knew. She was expecting horns.
A pastor told a good story about which Protestant denominations went west on horseback, waited for the stagecoach, or waited for the establishment of railroads.
Of course, Christians are trinitarians and Jews are not. Yet both believe in the Ten Commandments.
However, it seems that people will confuse accidents of history, and poorly understood differences in culture, with nationality, race, or religion.
As an economic conservative, I am disappointed with leftist believers. Their economic views are simply mistaken. Unfortunately, when members of the religious left have to choose, I think most choose socialism or LGBQT+ over faith.
There were Catholics in Texas, New Mexico, Arizona and California before there were any Protestants there—Spaniards or descendants of Spaniards, and their Indian converts.