Members of the Church of Jesus Christ of Latter-day Saints, or Mormons, do celebrate Christmas to commemorate the birth of Jesus Christ. Mormons believe in the Christmas story as described in the gospels of the Bible. They also include an additional account from “The Book of Mormon.”
“The Book of Mormon” is a spiritual and political history of people who migrated from the Middle East to the Americas that Mormons believe is scripture. Because the Church of Jesus Christ of Latter-day Saints is an international church, Mormons celebrate Christmas in a manner customary to the country in which they reside. For example, Mormons from Greece or Cyprus celebrate Christmas in January, since that is when the Eastern Orthodox holiday is commemorated.