This reminds me of the second half of the Hyperion cantos by Dan Simmons
I <3 the sci-fi gods like Herbert, Heinlein and Asimov, and they all had great sci-fi takes on religion ... but Hyperion has THE best take on sci-fi religions IMHO.
You mean the Endymion books, or Fall of Hyperion? I'm rereading the latter right now..
I <3 the sci-fi gods like Herbert, Heinlein and Asimov, and they all had great sci-fi takes on religion ... but Hyperion has THE best take on sci-fi religions IMHO.