The Mormon (The Church of Jesus Christ of Latter-day Saints) and Seventh-day Adventist religions are both Christian religions. The core belief in both churches is that of a redeeming son, sent by God, to pay for the sins of humanity and that faith in this belief will lead to eternal salvation of the soul.

Why Seventh-day Adventists do not celebrate Christmas?

As most may already be aware, Seventh-day Adventists do not eat pork, so eating it at Christmas is not even part of the equation. For them, it is not evidenced that Jesus was born on December 25 so they refrain from being caught up in the commercial aspect of Christmas. However, they still celebrate the birth of Jesus.