Oddly, the book is not without some controversy. Having read the book, I can't see what the fuss is all about. It helped me grasp some "theological" concepts while it made think about others. Christianity Today has done several articles that might be worth a read:
1. Reading in Good Faith
2. Fiction for the Faith-Starved
3. The Trinity: So What?
There may be some things that some Christian readers will find disturbing, especially theologically. You can get a hint of that from reading a few of the reviews on Amazon.com. But for me, the book was more about hope and love, forgiveness and healing, and about an intimate relationship with an Almighty God.
So I encourage you to get a copy, read the above articles, even the Amazon reviews, and then get settled in a favorite reading place, hold your cup of whatever in one hand, the book in another, and begin to be touched and moved.