Most of what I could say about this I already said in my Wardrobe review. You can scope that out for the meat, but here are a couple of potatoes. 
 I mentioned I don't focus so much on the religious parts, but there are a couple of parts in this book where it puts the parable parallels right in your face. If you have a nodding acquaintance, or even a nodding off acquaintance, with parts of the gospel, you'll pick up on it pretty easily. But it tends to show God's/Jesus' (Aslan's) most assholish qualities. Don't get me wrong, I understand the "obey" aspect of the instructions, but does he have to be such a jerk? (view spoiler)[He's standing there on the side of a hill in the woods and wants the kids to follow him because he knows the way out, however only Lucy can see him. Lucy tried to convince the others he's there and that they should go that way, but since they can't see him they decide to go a more sensible way which doesn't work so well in the end. However, given the information they have it's still the most sensible course. While everyone is asleep, Aslan appears to Lucy and admonishes her for not following him and making the others come as well. Why he doesn't just make himself visible to everyone so all can get where they're supposed to be going, I have no idea. That's God for you. (I think He's insecure, myself; always needing people to need Him). We're not to know the whole picture; we're to obey. I personally think that's kind of shitty, and if I had a friend who behaved that way we wouldn't be friends for long, but I don't make the rules. (hide spoiler)] 
 Then there's another part where Aslan is romping through a town working miracles, but that section made me think of The Infancy Gospel of Thomas. I don't know why since he's not killing kids (kind of), and striking their parents blind when they bitch about it, and his daddy isn't wringing his ear and telling him to behave, or any of that stuff, but the miracles seem to be similar to those of childe Jesus, and kind of mean even if the bad people had it coming. Like I said in the wardrobe review, the lines between good and bad are crystal clear as is the comeuppance and karma. 
 Another side story: When I was a kid I used to confuse this book with the Prince Valiant comic strip and started to read that in the Sunday comics before I ever read this. I eventually found Caspian and Valiant were two different things, and admitted to myself that Valiant was boooooooooring, was actually a misnomer for Prince Valium and quit reading it. I wanted to like it since I thought it was related to those books in mama's bookcase with the fun covers, but no pictures and were a bit beyond my ability to read at the time. (So was Valiant. Hell, that's beyond my ability to manage at 36. Sarlacc's bowels move faster than that shit, and if you follow that reference, I'm sorry. You're just as big a Star Wars nerd as I am, and that's nothing to be proud of). 
 And I seem to have gotten off track again. This book is a nice, fun, kid's fantasy-adventure story. Check it out if you like such things. 
 Also, the audiobook version read by Lynn Redgrave is done really well.