If you must read this book, just check it out from a library or borrow it- you wont pick it up again.
I just couldn't suspend my disbelief long enough. This "God" character loves us, doesn't love us, loves us... He just needs to make up his mind. In that respect (and more) he's not a very well thought out character. Him and the Jesus fellow. I first thought he was his son, but then he turns out to be him... but still his son... It kinda seems like the author just stole that idea from "Fight Club" but butchered it.
Just wait for the movie, hopefully the special effects will save this awful book.