I didn't find Sawyer's treatment of Christianity offensive at all, and even thought he evened the score a bit by having Neanderthals not believe in the big bang (something most of us believe is true) and not have gotten into space... but then I'm not religious so I might not be the right person to ask.
I thought the Neanderthal culture was pretty much a utopia until the unjust trial started. At that point it became evident that human nature is still human nature, and although the Neanderthals' culture is certainly more environmentally friendly, it's by no means perfect. I did love "what's your contribution?". Much nicer and more focused on the big picture than "So what do you do?". Nobody in that culture could ever choose a career without really thinking about it, with people asking that question as small talk!
The eugenics thing was definitely interesting, but I'm not going to agree that it's repulsive. Is it more repulsive to have some conscious, directed thought put into our reproduction (or lack thereof) than for us to just randomly breed with
no apparent thought for what we're doing for the species? I wouldn't say so. Eugenics is not a bad word... it happens every time a person makes a decision to have or not have a child based partly on thoughts of the far future. There are lots of people who decide not to pass on their genes because of a known (and hereditary) defect, and lots of childfree people who donate eggs or sperm because they have characteristics they honestly think are worth passing on. That does happen. It's eugenics of a gentle sort, and of course it happens alongside all the responsible people who "just want kids" but limit themselves to one or two out of respect for the environment and the future population of the earth.
The idea of breeding excessive violence out of the gene pool by forced sterilization (or at least forced not-breeding) isn't a new one, though I doubt it would work in as straightforward a way as it does in this book and... ummm... a Sheri Tepper book in which the same thing is done (avoiding the title to avoid a massive spoiler). Whatever the genetics of the traits involved are, they're probably subtle and a combination of the expression of many genes. I do personally like the idea and find it rather kinder than the death penalty, and I wouldn't mind some form of population control too as long as I'm daydreaming, but I don't think these ideas are likely to take hold in Western societies anytime soon... for better or worse, we're too big on individual liberty and also
way too invested in the pronatalist "everyone should want and have children" mindset.
(I noticed Sawyer was very careful to have the "huh, our gene pool COULD be cleaned up a little" thought come from a traumatized, raped woman, precisely so she could be excused for having such a sensible, whups, I mean repulsive thought.)
The book itself was good--as I said in the November Reads thread, a much faster and more fun read than I was expecting. To answer Kamakhya's question, I don't know how realistic the geometry and (apparent) physics of the gateway are, but the general workings of the quantum computer are totally consistent with what I heard about them in college... not that I heard a lot, but one of my engineering profs did discuss them one day. The part that seemed diciest to me was the "so after it ran out of alternate universes in which it existed, it reached out to
this one because, uhhh, we're special!"

Ah well, it was as good a device as any for getting the two universes in contact.
Can't wait for Humans to come out in paperback.
