I very much recommend
Rebecca's post on
The Lion, the Witch, and the Wardrobe as a remedy for the tendencies, which seem to be rampant these days, to play it up as Christian at the cost of overlooking it as what it really is: a story. It taps into Christian imagery, and here and there illustrates Christian claims in its own way; but it's a story, geared to the imagination, not a doctrinal treatise in story format.