People are comfortable with categories. That's just how they are. Categories help to take the guess-work out of life. If you're a Democrat, you are pro-choice, pro-taxes, pro-LGBT, and pro-welfare state. If you're a Republican, on the other hand, you are pro-life, support tax cuts, have Judaeo-Christian values, and want people to go out and get a job. Sound familiar? We complain about the two-party system, but when someone actually challenges it by failing to conform to one of these sets of ideals, we refuse to consider him/her a possibility. Beyond that we love our musical, literary, and cinematic genres. We love our simple, clear-cut, black-and-white categories. The same, I have found, is often true of our theology. You're a Baptist or you're a Presbyterian. You're a Methodist or you're a Catholic. You can fill in the blanks with any "ism," "ist," or "an" you like. It's not simply the deno...