A New York Times bestselling author is warning that Christians are in real danger of persecution — in America. And this warning comes from a surprising source, a prominent secular Jew. David Horowitz argues in his new book "Dark Agenda: The War to Destroy Christian America," that secularists and leftists want to turn the nation into a godless, heathen society where religion has absolutely no role. Horowitz, who heads the David Horowitz Freedom Center in Los Angeles, is used to taking controversial positions. He is the New York Times best-selling author of "Radical Son and Big Agenda: President Trump’s Plan...