Micah becomes a seeker, those who represent Prince Ryan and help people come to him, and goes to the outerworld to find his rebellious brother and bring him back. He has amazing adventures that are full of trials but inspiring. The book is great to read even without the religious allegory, but see how many scripture stories you can find alluded to in it.
The Divine King left years ago as the kingdom of Theikos fell away from faith, but legend prophesies some day his heir will return, the new Divine King. When the time comes for him to come, some people have lost faith in him, some are eager for him to come, and some want him dead. He comes at the risk of his life, but if he doesn't, the kingdom will surely fall.