Tl;dr: book is garbage, don't bother. Author just copy/pastes Syria and ISIS to Republic of Texas and the Heavenly Kingdom. One of the main characters is even a dumb middle class white girl from what's left of the United States who gets catfished into being a not-ISIS war bride. The rest is just standard capitalism and Christianity bad, socialism and anarchism good. Also, the author does that thing I've noticed leftists do where anarchist society=24/7 sex and drugs and nothing else.
Podcast is worth listening to, skip the book.