I was inspired to read this after watching the film, which at the time I thought was extremely powerful and underrated. It didn't have the religious aspect of the book, which put me off the latter somewhat. I actually found this quite disappointing. It's a great idea and has excellent characters, but I was somehow dissatisfied. The religious theme didn't work for me; in the film this was absent, presumably as it's unfashionable. I found myself put off by it, which is maybe just my personal prejudice. But it was simplistic, and I might have appreciated something more challenging like Doris Lessing's use of the Old Testament/Torah in Shikasta, or Philip K Dick's imaginary religion in Do Androids Dream of Electric Sheep, or a less overt/specific spiritual strand.