Is there such thing as too much christianity? And if there is, how is that a bad thing?????
I wonder if the question we're discussing is not so much how much Christianity there is in the movies, but rather how it is presented.
Consider the dilemma everyone involved with the production of the films faced: part of their audience knows about the spiritual elements and aspects of the stories and expects them to be faithfully reflected in the films.
Yet another segment of that audience is not familiar with them - and they're not likely to appreciate going to the movies to be entertained and receiving a sermon instead, especially if it's delivered with all the subtlety of a hammer hitting an anvil.
In the case of VDT, some would say, the green mist was that hammer-and-anvil.
To quote something Lewis himself wrote:
What we want is not more little books about Christianity, but more little books by Christians on other subjects — with their Christianity latent.
To paraphrase, focus on your subject (in the case of these movies, telling a good story), and the worldview will follow, behind the scenes perhaps but not hidden.
If I may digress a moment: as a (very!) amateur writer I consider this an excellent guideline: tell a good, entertaining story. My worldview will follow, reflected in the plot or in the characters themselves (what they value, how they behave). A sermon or a bunch of Scripture quotations are not needed. (To be sure, there are times when these may be appropriate, and some writers and genres use them in good stead).
This relates to visual media too. To use another example, I enjoy watching Star Trek, and there are some memorable episodes that tell wonderful stories. But, unfortunately, at times the writers weren't shy about making a point, and this resulted in some rather infamous episodes that didn't focus on story but made that point with the hammer-and-anvil approach.
Consider also that Lewis didn't write the Chronicles to be Christian allegories or catechisms or sermons, but tales that might entertain and in so doing open readers' minds to the truths of God:
I thought I saw how stories of this kind [Narnia] could steal past certain inhibitions which had paralyzed much of my own religion in childhood. Why did one find it so hard to feel as one was told one ought to feel about God or about the sufferings of Christ? I thought the chief reason was that one was told one ought to. An obligation to feel can freeze feelings. And reverence itself did harm. The whole subject was associated with lowered voices, almost as if it were something medical.
But supposing that by casting all these things into an imaginary world, stripping them of their stained-glass and Sunday School associations, One could make them for the first time appear in their real potency? Could one not thus steal past those watchful dragons? I thought one could.
To sum up, tell a good story without hammering your point home, and trust your audience to be intelligent and perceptive enough to get any message you wish to deliver.