Personally, I wasn't blown away by any amazing revelations in this book, but that is because the depiction of the Trinity (God, Christ and the Holy Spirit) within this story is how I percieved God anyway.
I found this book more re-assuring then anything else in that my view of God is shared by others.
But I expect there are a lot of fundimentalist Christians, and athiests who have believe God is bad and vengful and all about damnation, who NEED to read this book.
This book will show that God is NOT about damnation, and all about love, guidance and just wanting a relationship with you.