In today’s intellectual climate, it is refreshing to find a book on the relationship between Christianity and politics that is neither a reactionary daydream nor a breathless polemic against anyone who thinks there could be Christian influences on political culture. Many of the bestselling books run to extremes—looking for a “Christian prince” who will wield political power to re-Christianize America, or defining “Christian nationalism” so broadly as to indict as a fascist anyone who thinks their “Christian values” should inform their policy preferences.