The Patron Saint of Butterflies reminded me in an odd way of The Witch of Blackbird Pond - both of these books made me reel from what some people believe it means to be Christian. The way they treat each other is so repugnant to me. In both of these books, God is a vengeful taskmaster who is waiting to punish those who sin and people take it upon themselves to judge others by what they believe God would think about their behavior.
I truly could not stop reading this book, it was a 1A.M. finisher for me. Highly recommended.