Is Aslan an allegory?

Throughout the Narnia Chronicles, the character of Aslan is allegorical of God and the Chronicles themselves are allegorical of Christianity. This is never more clear than in the final chapter of this novel when Aslan reveals himself to be both the Lion and the Lamb of God. The land at the end of the world is said to be Aslan's country and this is allegorical of Heaven. Aslan tells the children that he is always with them and showing them how they can get to his country from their own and that there is a door from their country that leads to his. When they find it they can be with him forever. This is an Allegory for the word of God which tells Christian's what they need to do in earth in order to find their place with God in Heaven.