Based on the love story of two devout Christians, the movie version of "The Vow," starring Rachel McAdams and Channing Tatum, strips the tale of its overt religious themes, which has some Christian reviewers concerned. The film is based on the true life story and book, “The Vow” by Kim and Krickitt Carpenter, which draws heavily on that couple’s Christian beliefs and the power of God to heal and shepherd a marriage through difficult times.