Sounds like you have more of a quarrel with the book than with the movie. Narnia, along with "Lord of the Rings" helped define the fantasy genre that still thrives today, a genre defined by the hero being the most unlikely of characters drawn by destiny into a conflict that he did not start, but is destined to end.
Sound familiar? Are we not living through that time right now, when George W. Bush, who many dismissed as being the most unlikely of people to lead this country, is now waging war against one of the darkest forces the world has ever encountered in the form of militant islam?
There's a reason this type of story works. The archetypes laid out in the Rings trilogy and the Narnia books are part of what give us the strength and courage to take on the enemies who would snuff out the light of our humanity and civilization. The heroes come from the least likely of places and are drawn into conflicts that at first do not involve them, but turn into personal missions.
You are, of course, free to laugh off the transformation of the child, the halfling, or any other "insignificant" person into a hero, but these stories will continue to give us hope against overwhelming odds.
Who was ever a less likely hero than the carpenter of Nazareth? And he really did save the world.
Your post #54 is outstanding. Here! Here!
I thoroughly enjoyed Narnia and let it carry me away to the place where all things are possible. I've been in an excellent mood for two weeks.