Screwtape on Christian Nationalism?

 I've been rereading The Screwtape Letters (for maybe the third time, I guess), and there's a passage in chapter 7 that seems incredibly relevant to the moment. Screwtape is instructing Wormwood on how to tempt his "patient" with regard to the outbreak of war. As is often the case, Screwtape brings up two opposing and yet equally effective temptations. One would be to make his subject a pacifist, and the opposing tactic would be to make him a patriot.

I'm focusing on what he says about patriots here. You may recall, if you've read the book, that Screwtape is advising a younger devil, Wormwood, on how best to tempt his subject away from faith, or if possible to twist his faith into something else altogether, though he still may think of himself as "faithful."

This is Screwtape on the subject of the temptation to Patriotism or Pacifism for Christians:

Whichever he adopts [Pacifism or Patriotism] your main task will be the same. Let him begin by treating the Patriotism or the Pacifism as a part of his religion. Then let him, under the influence of partisan spirit, come to regard it as the most important part. Then quietly and gradually nurse him onto the stage at which the religion becomes merely part of the "Cause," in which Christianity is valued chiefly because of the excellent arguments it can produce in favor of the British war effort or of pacifism.... Once you have made the World an end, and faith a means, you have almost won your man, and it makes very little difference what kind of worldly end he is pursuing. Provided that meetings, pamphlets, policies, movements, causes, crusades, matter more to him than prayers and sacraments and charity, he is ours--and the more "religious" (on those terms), the more securely ours. I could show you a pretty cageful down here.

As I said, what interests me here is how this applies to "patriotism," or in our current setting, Christian Nationalism. I think every point Lewis is making here applies to pacifism as well (or environmentalism or any other good cause), but it is the form of patriotism known as Christian Nationalism which seems to be swamping the church these days.