All right, the first thing to note is that this is aimed at 10-year-olds and up. Not surprising, since the author has been teaching 6th grade English for years. Keeping that in mind, the parallels are great, and the story is compelling once you get into the alternate world. The down-side is that some of the descriptive language is laughable, and the similes are awful. I had a very hard time getting through the beginning of the story, but by the time it ended, I downloaded the second book.
Overall, I'm glad someone is using the Fantasy genre to bring a Christ-representative story to readers who would otherwise be reading about witchcraft and false gods.
One of the best series I have read from Stephen Lawhead. It is well written an very well Narrated. I hope Lawhead soon goes back to creating more fantasy books like this.