Christmas is a time to believe in Jesus

He was in the world, and though the world was made through him, the world did not recognize him. He came to that which was his own, but his own did not receive him. Yet to all who did receive him, to those who believed in his name, he gave the right to become children of God—children born not of natural descent, nor of human decision or a husband’s will, but born of God. John 1:10-13 (NIV)
Christmas is when Jesus came into our world 
Jesus has not been recognized as God in the flesh
Those who do believe Jesus is God in the flesh are re-born as God’s children
Christmas is a time to believe in Jesus