The universe, plot, and characters are all aggressively atheistic[1]. Meanwhile the prose is heavily infused with Christian religious language, references, and allusions.
Consequently, I'm not really sure who the book is for. I don't know any Christians who like atheistic hard scifi (although, I exist so there must be others). And I don't know many people into hard scifi who really care for the religious imagery.
Personally, I find the experience to be unique, so I think it's worth it if you can get into it.
Besides that (and to spoil the point of the book) the biggest flaw is that the author doesnt seem to trust the reader to get the point, which is that consciousness is an unnecessary (and detrimental) evolutionary dead end. Real intelligence is totally orthogonal.
As a software engineer who has seen very intelligent systems with no more consciousness than a paperclip for decades, I got on board with the premise as soon as it showed up. But then I kind of had to wade through case study after case study highlighting the idea.
[1] - this isnt atheism that's aggressive, but rather a universe where there's no doubt that there is no god with all of the consequences thereof.
Every book of fiction is aggressively atheistic, because every fiction is perceived by an believer as attack on his one and only fiction.
PS: And i write this a somebody, who is forced by the enlightenment to admit that your fiction is the only one producing a lawful high trust society and thus should be the governing basis for a working society.
> a universe where there's no doubt that there is no god
Do you mean that the universe itself provides clear, incontrovertible evidence there is no god? Or do you simply mean that in the universe portrayed, none of the people happen to have any doubt about the non-existence of god?
> The universe, plot, and characters are all aggressively atheistic[1]. Meanwhile the prose is heavily infused with Christian religious language, references, and allusions.
I don't think there's any contradiction here. Atheists are often more interested in religious content than most religious people are, who just how with basics, vibes and traditions. Atheists (especially those that were raised in religious environments) are kind of morbidly fascinated with religious mythos.
It's the same reason why Evangelion uses a lot of Christian imagery.
Religion aside, the imagery is undeniably cool. It goes hard.
No other reason is required.
For better or worse Christianity is the shorthand language of Western culture since so much of art philosophy and media draw from it. Plenty of non-religious (and even irreligious) works employ it for symbolism or metaphor, or like Hideaki Anno putting Christian symbolism all over Evangelion, just for the aesthetic.
> And I don't know many people into hard scifi who really care for the religious imagery.
https://en.wikipedia.org/wiki/Hyperion_(Simmons_novel) is a massive classic and is full of that stuff. The Matrix has The One die and be resurrected as a godlike glowing being.
Most atheists/Christians aren't as rigid as you imagine.
> a universe where there's no doubt that there is no god
The vast majority of scifi (and other genres) doesn't care or take a position either way. Nothing in Blindsight says "there can't be a God"; it has nothing to do with that.