Yes, the creation of the Tolkien universe most certainly has the most direct inspiration from Christian myth, but to say the entire thing is based on it is a mu

Yes, the creation of the Tolkien universe most certainly has the most direct inspiration from Christian myth, but to say the entire thing is based on it is a much stronger statement. Once the earth is formed to the point of the arrival of the elves, most of those stories afterward have very little comparison to anything in Christianity. Beren and Luthien, the creation of the rings, the wars over the Silmarils...perhaps I was just misunderstanding what you meant by the "whole mythology is directly based on christian mythology". As I mention in another comment, there is certainly a lot of Christian inspiration in the framework of the world, and you do see that in how it is all set up in the first few chapters. The stories themselves (built within that framework) seem no more related to Christianity than any of the other places they draw inspiration from.