One of the dominant myths of the Left is that religion in America is populated with a large group of Pentecostals, fundamentalists and evangelicals who are political activists for conservative social movements and the Republican party.
This is flat out wrong. When a leading Lefty French thinker, Bernard-Henri Levy (BHL to any educated French person) came to the United States on behalf of the Atlantic magazine to look at America from the perspective of Tocqueville he was particularly interested in the religious right. He did a thorough job and was excommunicated from the American Left. The Left hated his findings and excoriated him in the New York Times and the New Yorker. He found no such thing as the religious right. It doesn't exist.
What BHL found was precisely what the Pew Forum national survey found: Americans have little or no attachment to the theology or teachings of any religion. Americans overwhelmingly believe that all religions are pretty equal. Americans have a preference for denominations that are not mainstream (because the mainstream is so politically identified with the political Left).
To Americans, religion is to promote family ties, to educate children about morals and to gather with other morally like-minded people.
That's it. The few religious sects that are prominent in social-conservative political circles are insignificant in number and importance. Look at the facts. If you have an open mind, you can easily see the reality.