Mort

Great fun. With Terry Pratchett's Discworld books, you generally know what you're going to get: breezy, thoroughly enjoyable satire, ranging from fairly dumb humor to really perceptive skewering of society. If you haven't read one of them, just pick one that sounds interesting and go for it. Mort is about a schmuck of a teenage boy who nobody will take on as an apprentice, but he lucks into becoming the assistant Grim Reaper, who it turns out is ready to pursue some earthly hobbies after all his years on the job. Good old Mort accidentally rips a hole in the fabric of reality while harvesting souls one night, and hilarity ensues. All good stuff. I also really liked Small Gods if you're more interested in the idolatry side of the religious conversation instead of the existentialistic side. Enjoy.