What are the motifs in Under the Banner of Heaven: A Story of Violent Faith by Jon Krakauer?

One phrase that reverberates throughout this book is the statement that there is one "mighty and strong" coming to reform the Mormon Church. In Joseph's Doctrine and Covenants, the Lord promises he will send this prophet to His people. There have been a variety of interpretations of this passage as well as a number of guesses as to whom this prophet might be. The fundamentalists believe this prophet will restore the principle of polygamy to the church. Those who lived in Colorado City believed Uncle Rulon T. Jeffs was the one mighty and strong. These people were deeply disappointed when their beloved prophet died.