Mark’s books are great fun to read. This book’s about a post-rapture, dystopian world with strong ties to the Revelation prophecies. Several things happen, and people play roles which go far beyond Biblical possibilities, BUT they are speculatively possible. That’s the reason I gave it it a four-star rating.
Spiritually, it’s a solid four also being thoroughly evangelical.
Knowing what it is, you’ll find it a solidly entertaining book.