Livre d'Or

doesn't the New Testament have the same problem?

A perfect example of why reading scripture like novels usually doesn't work. The NT has roughly the same structure as the Tanakh: some important narrative expounding the origin of the faith, some discursive and prophetic material, and a single apocalypse at the end. To be honest, the NT would benefit from some poetry...

Revelation suffers greatly from being read by Christians as though it were unique, rather than the best of a very mixed genre all of dubious provenance. I'm not sure a fantasy treatment of Christianity needs it.

The failure of the world to end punctually within the lifetimes of the apostles was an immediate problem for early Christians; there's even some editorialising about it in John's Gospel. But from a Narnian point of view, the problem is more acute: Aslan's death and resurrection [I]don't[/I] seem to have a big historical impact on the world, and the spiritual effect is just as invisible as in our own world. The only Narnians who later appear to care about the specifics of Aslan's 'passion' are the evil cultists in PC. Other than that, it's business as usual. The invasion of the Telmarines is clearly the largest demographic shift in Narnian history; Jadis' reign of terror seems short in comparison.