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Aslan is suppose to represent Jesus...
The main story is an allegory of Christ's crucifixion. Aslan sacrifices himself for Edmund, a traitor who deserved death, in the same way that Christ sacrificed Himself for sinners. The cross is replaced by the Stone Table (which was used in Celtic religion), both being pagan symbols, in contrast to Christ. Additionally, the splitting of the Stone Table reflects the veil of the temple splitting at the point of Christ's death. As with the Christian Passion, it is women (Susan and Lucy) who tend Aslan's body after he dies and are the first to see him after his resurrection. The significance of the death contains elements of both the ransom theory of atonement and the satisfaction theory: Aslan suffers Edmund's penalty (satisfaction), and buys him back from the White Witch, who was entitled to him by reason of his treachery (ransom). Christ is also associated with lions.
Aslan's country is where his father reigns (God) and is suppose to represent heaven.
Prince Caspian is suppose to represent Moses in a way. He frees the Narnian's so they are able to come out in public with the Telmar's.
Source(s):
http://en.wikipedia.org
If you look up Narnia you will find information on all the books and whose associated with who. But this is only from "The Lion, The Witch, and The Wardrobe"