GOOD OMENS by Terry Pratchet and Neil Gaiman
This is, hands down, the funniest book about the end of the world there is. It was published in 1990, five and a half years before the first Left Behind book - managing the highly improbable feat of spoofing an entire genre of poorly written, theologically unsound, not-worth-the-paper-they’re-printed-on novels before they were even written. That’s the British for you.
Alright, so it’s actually a spoof of films like The Omen, at least according to the Wikipedia article about the novel. All the requisite elements are there - the Antichrist (as a human child), the Four Horsepersons of the Apocalypse, the rapid approach of Armageddon, etc. There’s also Crowley (”an angel who did not so much fall as saunter vaguely downwards”) and Aziraphale (first impression: “intelligent, English, and gayer than a tree full of monkeys on nitrous oxide”), who tend to affairs on earth for their respective employers - and neither of whom is ready to see the earth destroyed. (They like it, after all.) Oh, and the Antichrist has been misplaced, so everyone spends a big chunk of the novel frantically trying to find him before someone else does.
And despite being ‘theologically inaccurate’ in a lot of ways - I almost hate to say that, because it wouldn’t be funny if it wasn’t ridiculously inaccurate - it has moments of almost profound truth. Not too profound, of course - they’re British, and this is a comedy, and too much profundity wouldn’t be seemly - but they seem to have understood more of Christ’s message than Tim and Jerry. Not that that’s very hard to do.