The Diviners (The Diviners, #1)

by Libba Bray

“How do you invent a religion?” Evie asked. Will looked over the top of his spectacles. “You say, ‘God told me the following,’ and then wait for people to sign up.”

“The line between faith and fanaticism is a constantly shifting one,” Dr. Poblocki said. “When does belief become justification? When does right become rationale and crusade become crime?”