"Christian nationalism is everywhere, yet nowhere," according to a new study about a topic that is often discussed but not well understood. Only 5 percent of American adults have ever called themselves Christian nationalists and just 28 percent are even familiar with the term, but it's nevertheless dangerous with potential to grow, said the study based on scientific polling from Neighborly Faith, an organization that seeks to introduce Christians to people of other religions. Relying on a variety of academics, the study said the definition of Christian nationalism, or CN, is that it is "a movement advancing a vision of...