In 19th Century America Joseph Smith claimed to have been given a new revelation of God and Jesus Christ. Almost 200 years later, the Church of Jesus Christ of Latter Day Saints numbers more than 13 million members.
Justin explores the key differences in belief between Mormons and Christians as he meets two men breaking the mould of interfaith dialogue.
Robert Millet is a Mormon and professor at Brigham Young University in Salt Lake City, Utah. Greg Johnson is a Baptist pastor in the city who founded "Standing together" - an organisation aimed at building bridges of dialogue between Mormons and evangelical Christians.
If you enjoyed this programme you may also want to listen to:
Unbelievable? 8 September 2007 - Mormonism & Christianity
You can visit Greg's ministry "Standing Together" at www.standingtogether.org
Join the discussion in the "Unbelievable?" Group at the Premier Community http://www.premiercommunity.org.uk/group/unbelievable