If you're looking for more books that have this theme, the Newton's Cannon trilogy (J. Gregory Keyes) gets into it in the third book. Also, the movie Dogma (though I don't want to say more than that for fear of spoiling things).

Fear not, I've read Keyes' Age of Unreason (though I think there are four books: Newton's Cannon, A Calculus of Angels, Empires of Unreason, and Shadows of God) and seen Dogma, so you may discuss them at your leisure.