This is a fiction work—sort of a cross between something by Lewis and just about anything by Wells (start here or here). The basic idea is that Christianity has dug its own grave by contributing to the rise of secularization, which will ultimately doom the church. Or so the "Deputy Director of the Central Security Council" believes, as expressed in a series of memos to the newly-designated director of the Los Angeles Bureau.
It's outstandingly quotable—a Twitter treasure trove. But the passage that's most stuck out to me is a bit longer than 140 characters. (Apologies in advance for the dreadful length.) Outlining strategies to raise America's level of secularization to that achieved in Europe, the CSC deputy director writes:
Certainly we have already cooled the spiritual temperature in Europe to an Arctic level where only the hardiest of believers can survive, and then only by huddling together in their spiritual igloos. ("Always winter, never Christmas," as one of their agents laments.) But, as you will soon discover [when you begin your post in Los Angeles], the steamy, equatorial spiritual heat of the United States has its advantages—not least in allowing us to cultivate exotic, poisonous hybrids which would thrive in no other climate.If we tried to list them all, how much time could we spend?