Q: How did the Church figure out if Jesus was born on December 25? Do we celebrate Christmas because Jesus saved us by being born?
However, we celebrate Christmas because of the same significant truth, which is that God took on human flesh in the person of Jesus. God the Son voluntarily allowed Himself to be conceived, born, grow, and mature in the normal course of human life. He became fully human so that by taking on our flesh He could stand in our place both in life and in death.