In an age like ours, of course, where fuzzy boundaries, vagueness, doubt, and caution are supreme virtues, Machen’s thesis is likely to appear both arrogant and overstated. But, as Machen himself says in the opening paragraphs, “In the sphere of religion, as in other spheres, the things about which men are agreed are apt to be the things that are least worth holding; the really important things are the things about which men will fight.” There is insight here. Before we see Machen as too intolerant,