I believe in love.
Here is a brief post from The Scriptorium that takes a look at two possible readings of "God Part II," asking if the song's narrator is sincere or not in the final affirmation of belief in each stanza. Excerpt: Luther spoke of the dramatic tension of the Christian life as one in which believers are simul iustus et peccator —at once fully righteous and fully sinful. This makes no sense, but it sure does explain a lot. On this second reading, Bono’s ‘I’ is sincere throughout, even if he is a hapless, sorry mystery to himself and us.