Right now I'm reading Søren Kierkegaard's Fear and Trembling. I read he explored the nature of Evil in Mankind using Abhram and Isaac's story (Mr. Kierkegaard was very religious), which seemed fascinating. But it started disappointingly. I've only just read 27 pages, though.
It's many years since I read Kierkegaard, but I would have said that Fear and Trembling (like many of his other books) were more about the problem of faith. That is, how hard it is to really believe, to make the requisite "leap of faith".