I’ll add that, in re-listening to the Narnia books, it certainly seems to me that the Narnians devotion to Aslan is semi-religious, and probably develops more religious aspects during the centuries when Aslan himself is not on the scene in and around Narnia… thus, nearly all historical periods except those covered by the books. 
Granted, there are a lot of differences between that and organized religion in our world.
I think you mean “Valar” here.
Because the entire society revolved around faith; a scholar could get beaten to a pulp for suggestion that the best way to find out how many teeth are in a human mouth is to count them, instead of answering from some ancient Greek/Latin/whatever book. It may have been based on medieval Europe, but the people didn’t have most of the medieval mentality.
oops! quite right.
Yes, it’s during the episode when the Dawn Treader is near the Dark Island.
And then there’s also Edmund’s fairly explicit “credal” statement in The Voyage of the Dawn Treader, after Eustace’s transformation from dragon back to human form. The statement talks about Aslan, his omnipotent nature, his relationship with each of the children (and the special role that Lucy plays), his sacrificial offering to atone for Edmund’s treachery, and the existence of his country in the east.
Here’s an article going into Tolkien’s reasons for having so little religion in Middle-Earth. Most of the sources for the article come from Tolkiens letters.
It is fairly important to keep in mind that the Middle Earth of the Hobbit and the Lord of the Rings took place in a time before Christ. So though Tolkien was a fairly devout Catholic, the people of Middle-Earth existed before even the prophets.
Numenor did revere Erü but no overt organized church.
The Valar and Maiar were orders of Angels and the fall of Melkor is similar enough to Satan’s Fall to hint at Tolkien’s Christian Roots.
He mixed in Norse and Finnish mythology to his myths. The Central importance of song was very Finnish in nature. Oromë is very Norse or Celtic in nature.
The Halls of the Dead resemble some composite of Norse and Celtic beliefs.
Jim
The Narnians celebrated Christmas so that would have to mean they were Christians, wouldn’t it? Or at least that Christianity existed in Narnia.
As to how they reconcile Christianity with their animal worship, I have no idea.
Probably just as well as they reconcile Father Christmas.
You mean the worship of Aslan? It’s easy. Aslan is Jesus, albeit in another form, suited for Narnia and it’s mostly intelligent bestial population.
Or to put it another way, it’s how they see Jesus. In our world, that’s how we see him. Presumably in another universe, they see him yet another way. Lewis more strongly implies that Earth and Narina are both shadowy reflection of…heaven, I guess. In keeping, Jesus and Aslan are both shadowly reflections of the real christ.
At the end, presumably they all see him as he really is.
One excellent suggestion (apart from “LWW was a fairy story and needed no more internal consistency than a tale that allows elves to be peerless shoemakers but somehow incapable of basic tailoring for themselves”, which covers a good many eventualities) is that King Frank and Queen Helen imported the custom of Christmas when they were instituted as Narnia’s first King and Queen in “The Magician’s Nephew”, and the non-human Narnians kept the tradition forever afterwards even after the human Kings and Queens died out.
I doubt it even needs to be a commandment so much as an instinctive revulsion towards eating something else that walks around and talks, although the fear of Aslan’s wrath certainly does point towards a religious view of him. (As do the prophetic rhymes that the Beavers recite to the children in LWW.)