Lucy in PC is a great example for Christians to follow if you ask me, both book and film.

When the other Narnians and Pevensies, especially Peter and Susan, doubted that Aslan was there still, and had given up on Him coming, Lucy still had hope that He was there, as she even had seen Him before the others had. She persistently kept convincing her siblings and Trumpkin to follow after Aslan when she was the only one to see Him. They followed, and they found Him, and saw the Lion Himself, and Narnia was saved.

I think this is a great message to Christians about following Jesus in this world. When bad things have happened, we doubt our faith, and others ridicule us when we follow something that they can't see. However, when we have faith, and persist on, we shall find what we are looking for, and we all know what that is.

I agree with Louloudi the Centaur. It showed there lack of Faith. And in the movie when they send Lucy into the woods it showed that they had faith in Aslan.