Let's begin by taking a look at the imagery of Santa Claus who lies at the heart of Christmas. The popular imagery of Santa Claus came from the poem A Visit From St. Nicolas, written in 1823 by Clement Clarke Moore. This poem is more popularly known as The Night Before Christmas which is faithfully read every year by most households. Like every Christian belief, even Santa Claus has his origin in Pagan culture.
Santa Claus is a disguise for the Norse God, Odin. If you ask anyone who follows the Norse belief he won't say that Odin is fat and jolly. Odin is strong and mighty. Odin rode upon an eight legged horse named Sleipnir. He was sometimes called Nik. The idea of Old Nick was later given to the Devil probably by the Church. As you can see, the name Saint Nicholas was also given to Santa Claus. This would imply that Odin, the Devil and Santa are the same figure.
Now let's examine this Trinity. First of all, the Church has condemned any worship of a God who is not Biblical, such as Odin. Secondly, any other God forbidden of worship is demonized in the eyes of the Church. Lastly, Odin, who's been denounced as the Devil is a festive icon during Christmas. This is an oxymoron of common interests where a God is denounced in one form and celebrated in another.
The fact that Santa Claus comes down the chimney is peculiar. Fire is the Devil's true element such as the fires of Hell. The Devil is believed to be a djinn which is a fiery spirit. When Santa Claus slides down the chimney is this a representation of him rejoining his element? Many Christians are becoming aware of the Pagan sources from which Christmas and Santa Claus originated and for this fact the celebration is often banned.