One reason why the separation of church and state is a good idea is that uniting religion and politics tends to do more harm to both than either could self-inflict on its own. Indeed, many of the early settlers in America were people who came here to escape from the Christian nations of Europe, which is why the very first amendment in the Bill of Rights contains a prohibition against government establishment of religion. But the same phenomenon applies on a smaller scale as well, and the current woes of the Republican party may be a case in point.