In the United States, the term united Protestants, Catholics and Jews under a banner of shared religious origins that excluded Muslims, he said.
“The Protestant, Catholic, Jew construct” of the Judeo-Christian ethos is based on the “rejection of the atheist and the rejection of the Muslim,” Smith said in an interview.
No shit, they're already kicking out Mormon's and fighting with popes too...
Eventually it'll just be Protestants, because Protestants can vote to "excommunicate" any church they want, it's how they handle when a woman gains control of one or it gets too liberal for any reason.
These things always get more and more selective about the in-group.
If you're not exactly like the core group in every aspect, you'll get trimmed off eventually