I think it's worth a read. I would say I didn't find it to be so cloyingly and obviously a parallel for Christianity as to be unreadable, but then, I read the series when I was a dumb kid. Now I am an adult, of course, but equally dumb. For some reason, I could never really get into Horse and His Boy. Nor could I get very far into Prince Caspian. Those two just didn't really engage me, I guess.