Ok, at this point I can only assume you haven’t read the book. I haven’t seen the series yet but from reviews I doubt it misses the mark that wide.
There is no world wide drop in fertility to near zero in the book and it is not a fertility crisis that starts the coup. It happens in parallel and is made worse by the war.
The book ends with a jump to future scholars talking about the rise and fall of white Western society.
The crisis in fertility is not the driver in the book, it is thrown in as a multiplier. It exaggerates the religious regime, it does not cause it.
