The depth of devotion evident in Bach's music would almost drive you towards being more religious. It's powerful.

There's an excellent site which I've looked at periodically for years which goes through every prelude and fugue in the WTC and gives an interpretation of them, along with religious interpretations where applicable for structures and phrases and voices and so on. It also lets you play single bars and things. It's very good:

http://jan.ucc.nau.edu/tas3/wtc.html

Here's my favorite lament, the C#m fugue, which is relevant given the article:

http://bach.nau.edu/clavier/nature/fugues/Fugue04.html