Faith is a recurring idea in "Left Behind: A Novel of the Earth's Last Days" by Tim LaHaye and Jerry B. Jenkins. The book is based upon the beginning of the Tribulation, the period in which the world begins its path toward the second coming of Jesus as well as the rising of the Antichrist.
Early on in the book, Rayford Steele and his wife, Irene, are at odds about faith. Although Steele was raised to go to church and try to live a good life, the man has never truly accepted Jesus as his savior. After Steele is involved a near fatal accident, Irene turns to religion and becomes a zealot. Irene pressures Steele to change and it almost ruins their marriage.