Our Christian NationChristopher Dawson was an English historian in the middle of the last century, one of those intellectuals prominent in his own day—T. S. Eliot called him “the most powerful intellectual influence in England”—but mostly overlooked in ours. Which is the usual treatment posterity gives to intellectuals, and usually for the best. But as to Dawson, it’s a shame. At this troubled juncture in American history, he is worth recalling. His lifelong subject was the study of religion and culture. And his lifelong thesis was this: Every great culture in the history of mankind has depended on “a common...