To reiterate the other reply to your post, God Emperor of Dune is the 2nd best book in the series. It really pushes the envelope on imagining what the final outcome of a religion might be. It's a little polemic-heavy, but it IS a god we're talking about. :) Book 5 is the sleeping pill. After the frenzy that is 1-4, 5 just plods along in a dense aftermath.