PERU—When Peruvian couple Caleb and Devora Quispe got married, Devora was a new believer. Caleb longed to become a missionary, but Devora preferred to stay home and help run the family sewing business. Caleb strongly believes that when a couple marries, they become one. “What God has put in my heart, He will put in your heart, too,” he tearfully told his wife, but she remained steadfast in her desire to stay home. Over time, her heart changed. When their church told Caleb he should remain home...