There will be those who didn't really grasp what and why Fowler did what he did when he wrote this book. It's essentially anarchic but not nihilistic in the way it treats the nature of existence.
The explanation at the end is what it is and exists to stop people arguing the toss over the interpretation. Bo Fowler is obviously aware and responsible enough to not allow the same mis-interpretation to happen to his book as happens to scripture on a daily basis. Somebody above seems to have missed that point in the book completely.
It's a bit strange at first because it seems so serious at the beginning but then goes on to be the funniest book I've ever read. A lot of minor detail might go over some people's heads because they aren't very aware of some religious beliefs but that won't mean they won't understand every little joke in the book. Don't read it on the train if you commute to work because you'll just get ridiculous fits of giggles and won't be able to stop even if you put the book away. In fact, don't even think about the things that happen in the story while in a public place - you might end up wetting yourself.
If you are an intelligent realist with an appreciation of being generally silly, you should read this book.