I've always enjoyed fiction that portrays supernatural or divine entities as if they were people. I'm thinking Pratchett & Gaiman's Good Omens, soMe of Tom Holt's fiction and films like Dogma. So I was looking forward to Mark Wilson's novel.
It differs from the aforementioned works in that it is more sweary, adult and perhaps more cynical. However, this gives it a more cutting edge for me. Wilson tells his tale from a number of perspectives including that of Jesus and Moses who have returned to Earth in order to try and save the human race. The cynical response they get from people is the source of much of the humour in the novel and feels as close to reality as it's probably possible to get in this kind of novel.
If you're easily offended by swearing and sexual references then this probably isn't the book for you. However, if you can look past that then you'll enjoy this book. In his own way Wilson tackles a number of deep philosophical ideas, albeit with his tongue firmly within his cheek. Interesting, funny and thoughtful. Read it.