Christmas is a day that is especially important in Christianity. Not important as physically organized Carnival, but the core is the love of God with the human world, that is, God loves human beings much more than sending him-until one of his, but a man with the name "Jesus" flesh.
To God be the glory and the element divisions is. To help mankind from slavery of evil and Sin, the different walls.
Hence the importance of Christmas is to celebrate God's love toward the human world. It is a real and see identity in Jesus Christ who came to a man more than anything else.