how is the Chronicles of Narnia a Christian allegory?

This story will remain a childhood classic for me. You might disagree with what I have to say here but perspectives are always an opportunity to ask question

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What are the Christian themes in The Lion, the Witch, and the Wardrobe?

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The Chronicles of Narnia: The Lion, the Witch and the Wardrobe, Softcover: C.S. Lewis: 9780064404990