The Da Vinci Code
For the churchgoing Christian, there's plenty to like about "The Da Vinci Code": The whole time, people are talking about the faith. The important places are locales like museums, libraries, and sanctuaries. Knowledge of ancient languages, (Western) history, culture, and art is essential. And it's oh, so literary, even to the point of playing with words, so that the keys to the puzzles lie with being able to figure out the clues within the words. Just delicious.
Ah, but for the churchgoing Christian, there's plenty not to like, as well.