The group of "christians" in question are the extreme right wing evangelicals who wish to violate the First Amendment in the hopes of creating a white christian theocracy.

The Establishment Clause of the First Amendment is meant to protect us from this sort of forced theocracy. 

Congress shall make no law respecting an establishment of religion, or prohibiting the free exercise thereof; or abridging the freedom of speech, or of the press; or the right of the people peaceably to assemble, and to petition the Government for a redress of grievances.