QUOTE : During the nineteenth, twentieth, and early twenty-first centuries, certain politically active religious movements sought to have the United States declared—officially, if possible, but at least unofficially—a "Christian nation." This was an attempt to reverse the church-state separation principles and achievements of such great Founders as Thomas Jefferson and James Madison. Roger Williams, who was more religiously devout than just about anyone living in later centuries, opposed all attempts to call a particular nation "Christian," just as he opposed the terms "Christendom" and "Christian world." His arguments included a profound analysis of the importance of separation of church and state as well as a deep religious understanding of what Christianity is.