"The festival of the Christian Church observed annually on the 5th day of December, in memory of the birth of Christ, and celebrated by a particular church service. The festival includes twelve days."
Webster's 1828

And, lo, the star, which they saw in the east, went before them, til it came and stood over where the young child was. When they saw the star, they rejoiced with exceeding great joy. Matthew 2:9-10

And when they were come into the house, they saw the young child with Mary, His mother, and fell down, and worshipped Him: and when they had opened their treasures, they presented unto Him gifts; gold, and frankincence, and myrrh. Matthew 2:11

Merry Christmas. -- It's OK to say it.
Visit the website of the Alliance Defense Fund to learn more about your right to celebrate Christmas.