Over at the Transpositions blog is a recent series on Star Trek and the Christian faith. Avid Trekkies will understand more of it than I do, but if you're interested in whether Spock is a Christ figure, and how the humanism of Star Trek challenges and converses with the gospel, then it might be worth a peek.
I've long wondered if, in the absence of a shared public faith, the genre of science fiction and fantasy is the easiest place for us to process our spiritual ideas. (We use soap operas to process morality.) The Force, Neo, the end of the world in its various forms (End of Days, The Day After Tomorrow, Armageddon), Lord of the Rings, Harry Potter, are all stuffed full of common religious themes, many overtly Christian, but take them in different directions. Recent Doctor Who's have a clunky 'Daleks as fundamentalists' subplot, making the most destructive and vicious creatures in the universe also the most religious. And there's those 'angels': maybe a more avid sci-fi fan than myself can blog on whether Doctor Who carries on where Star Trek left off.