“The Shack” a Shank?

Because I’m always a sucker for heretical books, I ran across this review by Tim Challies on a novel entitled, The Shack. I have never heard of this book before, but judging by the reviews online, I guess I’m the only one. But according to Challies, it’s got serious errors, particularly on the portrayal of the Trinity. Does this count in my 1,500 books needed to graduate?