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 & gradually nurse him on to the stage at which
the religion becomes merely part of the “cause”, in which faith
is valued chiefly because of the excellent arguments it can produce
in favour of the U.S. war-effort or of Pacifism.

The attitude which you want to guard against is that in which
temporal affairs are treated primarily as material for obedience.

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,
and crusades, matter more to him than prayers & love,

Now, he is ours & the more “religious” (on those terms)
the more securely ours.

I could show you a pretty cageful down here.

C. S. Lewis’s diabolical advice in Screwtape Letters, chapter 7