About using Bible references in U2 Music:

"We've found different ways of expressing it, and recognized the power of the media to manipulate such signs. Maybe we just have to sort of draw our fish in the sand. It's there for people who are interested. It shouldn't be there for people who aren't." -- Bono on faith, quoted in U2 at the End of the World

If you want to know about some of the lyrics based on biblical stories and imagery, go here.