using the character of Aslan the lion as His analog; Lewis does this in language that children find easy to understand, but at the same time the language is not so simple as to make the series unenjoyable for adults. Lewis’s Christianity never intrudes. The Chronicles aren’t a dull retelling of Bible stories or a boring Sunday-school lesson; like everything written by Lewis, the books are eminently readable and while there are great lessons to be learned from them, those lessons are couched in terms of fantasy and adventure that attract and please the reader of whatever age."
http://www.lewrockwell.com/elkins/elkins44.html