I think the author had a dual agenda with this book: a) a warning to sustain manufacturing since an import cutoff would lead to chaos and b) a religious message that repelled me sufficiently to issue a warning of my own - the author seems to have reserved heaven for a select group that is willing to undergo his form of baptism, effectively eliminating not only all non-Christians but many Christians as well. That sounds to me like it would be a really lonely place.
The writing style is sufficiently simple to border on simplistic. However, despite that and despite the excessive space devoted to Point b) of his personal agenda (I agree with Point a) albeit for more complex reasons) he has written a fast-moving yarn carried by a plot with some interesting twists and turns even with his oversimplified characters. I actually enjoyed the pacing. The book can be a fun read if taken with a grain of salt.