This is the third book I have read by Vonnegut and it is clearly his best. He is very funny in this book. The book is squarely in the tradition of post war American literary satire, and is one of the best examples of that genre.
The book examines the function and purpose of religion, and also the potential apocalyptic side effects of modern science. The two are wonderfully and tightly combined in a satire that is at times so absurd that it prefigures Douglas Adams. The book is filled with ideas but it is so lightly and humorously written that these just bounce around. The made up religion is delightful and somehow simultaneously a defense and an attack on organized religion. The apocalypse comes about unintentionally for entirely foolish reasons. It seems to me the best humorous apocalyptic work that I have read about the cold war and is very much an outgrowth of that periods terrors.
It well deserves its reputation