The insistence that not only was America founded as a “Christian nation” but that the standard citizen is a white person means resisting a racial and ethnic inclusivity. The fear is that new people would bring a new, less-Christian, less white-centered culture. It comes from a pervasive sense of “us”—meaning white people—and “them—meaning virtually anyone else of any different race or ethnicity. As long as white evangelicals either consciously or sub-consciously assume that American means white or European descended, they will always perceive changing demographics as a threat to “the American way.”
I think so many people have taken biblical scriptures out of context on this, to say stuff like, “Well, Jesus was a refugee.” Yes, He did live in Egypt for three-and-a-half years. But it was not illegal. If He had broken the law then He would have been sinful and He would not have been our Messiah.