Satan does not celebrate a birthday. According to Christian tradition, the angels’ creation and fall occurred prior to the beginning of linear time.
Lucifer is the devil’s given name, which translates to “Bringer of Light.” According to Christian belief, Lucifer was the most beautiful and powerful of all angels. God revealed to the angels his purpose to create humanity, man’s fall, and the coming of his son Jesus Christ to save humanity. Lucifer resisted the thought of serving animals he deemed inferior. According to tradition and the Book of Revelation, Satan recruited a third of the angels to join his revolt against God’s plan.