No idea, tbh. I'm nearly half way through it and I've yet to hear anything controversial other than religion is basically made up, but I already thought so. It's really just super thought-provoking stuff.

If I were to describe it, I'd say it's moreso an incredibly well thought-out narrative on the story of the human species and where we fit in time and space.

For example, the part this meme is from blew my mind. It's a couple paragraphs and gets set up with the backdrop/context of the agricultural evolution and kind of comes out of nowhere.

Lastly, one interesting thought I had while reading it is how evolution doesn't really "care" if we're depressed, as long as we're still reproducing the cycle continues (this was moreso a thought I had while reading the book than something explicitly said, I think)