Lewis's Christianity was an essential part of the series.

I agree, Bingley. It was a board member who suggested that I read the Narnia series, so my first introduction to them was just about a year ago. I thoroughly enjoyed them, I might add. I don't recall that the name of Christ was belabored; but the values run through the very core of the books: they are, by and large, what make the characters do what they do.