Religion in Sci-fi

I just finished Hugh Howey’s Wool, omnibus edition.  My rave reviews are posted elsewhere.  For this blog, I want to say that the only overt mention of religion was that the Silo had priests.  Where they were, we don’t know.  We never meet them.  The heroine, Juliette says, “… the priests said it had always been here, that it was lovingly created by a caring God, that everything they would ever need had been provided for … What god would make so much rock below and air above and just a measly silo between?… man wasn’t supposed to exceed his bounds”  Despite the lack of religious content within the story, the metaphysical symbolism that encloses this world is powerful, and given the solid reality of the setting, surprising.