From TPMCafe: 

What I describe as Christian nationalism is not synonymous with evangelical Christianity or even Christian fundamentalism. It is, rather, a movement that purports to have extrapolated a complete governing program from the bible, and that claims divine sanction for its campaign of national renewal. It promotes a revisionist history in which the founders were conservative Christians who never meant to separate church and state, and in which America's true Christian character has been subverted by several generations of God-hating leftists. It explicitly condemns the Enlightenment and denies that Enlightenment values had anything to do with our nation's original ideals. The movement's literature is so vast, its alternative skein of pseudo-facts so intricate, that it often seemed totally impervious to outside argument.

SNIP

I am certainly not suggesting that theocratic dictatorship is imminent in America. Rather, I'm saying that the Christian nationalist movement has a proto-totalitarian ideology and structure, and that, while it only represents a minority of Americas, it has amassed more influence than those who cherish secularism and pluralism should be comfortable with … As I write in the book, "As Christian nationalism gains influence, it is changing our country in troubling ways, and its leaders say they've only just begun. It is up to all Americans to decide how far they can go."

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