Anyone familiar with the history of conservative thought and politics in the United States knows that there have always been tensions among various strains of the “movement,” not least that between traditional Christians and secular libertarians. See, for example, George Nash’s The Conservative Intellectual Movement in America.
(To simplify severely, the Acton Institute can be seen as straddling this tension, often taking up policy positions that are shared by libertarians but hewing to Christian tradition with respect to the existence of objective moral norms, etc.)
It is within this context that one might consider Andrew Sullivan’s new book, The Conservative Soul. In one sense, Sullivan’s views are simply another instance of the ongoing tension between religious conservatives and libertarians. But then Sullivan is a special case because he considers himself Catholic (though hardly a traditional one). He also stretches his connection to conservatism to the breaking point (or past?) by characterizing anyone who accepts the possibility of knowing any truth with certainty as “fundamentalist.”
The basis for my comment is this scathing review by Mark Gauvreau Judge.