The Shack - my thoughts

Took the time to read The Shack over the weekend. This is a novel that seems to have taken parts of the Christian world by storm, with over three million copies in print. Its a story about a guy (Mack) who's daughter is abducted during a vacation and how he deals with her brutal murder. Most of the words written about the book are to do with how it portrays Mack's meeting with the Trinity - Father, Son and Holy Spirit back at The Shack where his daughter was most likely murdered. Author Paul Young (He calls himself WM. Paul Young - which is a pretentious way of saying William, I assume) portrays God as a black woman, Jesus as a not too attractive looking guy and the Holy Spirit as some form of free spirit with no real bodily form. The relationships between the three of them and how they then relate to Mack is the basis of most of the book. The key thing of course is that this is a novel - a work of fiction. Some of the stuff that has been written about the book would make you think it was a new version of the Bible. Its a novel.
Is it helpful in understanding the Trinity? In part I think it is - it would be worth hearing a theologian discuss the way this is portrayed in relation to what the Bible says.
Must go looking on the web.