Instruct: Classify the given review into positive or negative sentiment.
Query: DIsturbing yet faith affirming.

As a Catholic, I found Dr. Martin's book to be bracing, and yet it never denies that the Catholic Church is truly the institution founded by Christ. Indeed, the first pope(St.Peter) denied Christ three times, and one of the first bishops betrayed his Master and committed suicide!Ultimately, the Church needs to return to the ideal of it's founder, and reject temporal power in exchange for the power of the Spirit.