What is the theme in The Voyage of the "Dawn Treader" by C. S. Lewis?

The search for God is a major theme in this story. This voyage becomes something of a quest or a search for divinity, much like the exoduses written about in the Bible. Aslan is like God to these Narnians. Aslan saves them when no one else can, Aslan protects them from danger, and Aslan was present at the beginning of their world.