The Mormons’ adherence to chastity and clean-cut family values has been mocked in a hit musical. But the leading opera singer Bryn Terfel has called for greater tolerance towards the faith after revealing how a musical journey to Salt Lake City resulted in a spiritual awakening. The second-fasted growing religion in American, Mormonism continues to attract hostility over its opposition to gay marriage and suspicion over some of the faith’s beliefs. The Book of Mormon musical mocked the do-gooding naivety of its young missionary protagonists.