Smith believed that he was called by God to restore the Church of Jesus Christ. The LDS church is a restorative faith founded in 1830 in New York. To answer your questions straight away: no they don’t all go door to door, they don’t have multiple wives, they do celebrate Christmas, but they don’t make Communion, and their mass lasts three hours. THERE ARE AROUND 6,000 members of the Church of Jesus Christ of Latter Day Saints in Ireland.