Evangelical and evangelicalism are common labels used in talking about modern Christianities, but they are fairly nebulous terms with non-codified definitions. Unlike a lot of other terms used to describe Christians it is not a denominational label (e.g. Baptist, Lutheran, etc.) or an umbrella term for several denominations (e.g. charismatic, high-church, etc.). And to further complicate things, denominations can even have evangelical and non-evangelical threads within...