He’s saying no such thing. He’s simply saying that tying the Republican Party to one faith is not a very good strategy to win over people of other faiths or no faiths. I’m saying that as a self-identified Christian.
Conservatives should fight diversity itself. Fight the culture war first, win elections second.
Your statement would make sense if the country had 46 faiths, with none of them more than a 4% share.
Fact is, the country was founded on a compact, the compact itself was founded on, reliant on, the People's having Christian principles and good moral character. The Framers themselves emphasized this point as a caveat, over and over.
You can't split differences or find common ground between Christianity and Voodoo or Candomble or Palo Mayombe or Hinduism the way you can with Judaism. Theoretically, one could stretch and include Islam as one of the "peoples of the Book", if it were not for Islam's hostility, and that of its chief aggrandizers.
One religion has to predominate, and Christianity has the best moral, historical, and pragmatic claim to being that religion. Goldberg is just doing his Jewish demurrer thing -- he uses the rhetorical device of preterition to lay his marker here -- in asking Christians to quit being so Christian about it. Well, sorry, Jonah, but when these Protestants invoke the protection and wisdom of Providence, they have a strong tendency -- a teaching by their Nazarene Rabbi -- to do it that way.