Here's an article by Travis McSherley over at Chuck Colson's BreakPoint site. In it he makes some quick, salient points about the insidious nature of The Shack. Here are a few quick quotes:
"[The God of The Shack] is not God. At least not the God of Scripture. He (or she, in this case) doesn’t speak like God, doesn’t judge like God, and—despite the entire premise of the book—doesn’t love like God. Nearly every aspect of God’s glory and power are distorted and diminished in the “Trinity” of The Shack."
"And as much as God’s majesty and power and authority are diminished, His Word is completely disregarded . . . With the tether to Scripture broken, the book makes plenty of bold, though unsupported, assertions involving God’s sovereignty, man’s free will, forgiveness, submission and relational hierarchy, the purpose of pain, the design of Heaven . . ."
". . . there are a number of truths in The Shack, even valuable ones . . . But these small nuggets of truth are in no way worth taking in the abundance of theological distortion."
You can read the entire article here.
To play off an old Jerry Reed song title: William P. Young got the gold mine; truth got the shaft.