The Stand To Reason blog has a thoughtful review on Prince Caspian. In short, Aslan is downgraded by the screen writers to the point of being weak and secondary. In fact, he is even an open theist.
I think STR makes valid points. I completely missed the open theist moment.
However, I still think the movie provides an excellent portrayal of faith. I had a great follow-up conversation with my sons about faith. I used the scene with Lucy at the bridge.
Faith is pulling your dagger out to face down an army of Telmarines. It is knowing you will win too, because of who is sitting right behind you. It is to have a quiet confidence that says, "bring it on."
As I told my class, "faith is a confident trust lived out." Scripture tells us faith is being sure of what we hope for and certain of what we do not see. Faith also expresses itself in love. We see all of these clearly in Lucy. Her adoring love for Aslan, her hope, her certainty and how it translates into action. She lives out her trust in Aslan in the bridge scene.
I tell my kids that we need to live out our lives knowing that Christ is in us, and greater is he that is in me, than he that is in the world. I tell them to think of Lucy pulling out that dagger with Aslan perched right behind her. That is what faith looks like.