Dear friends,
I have compiled a list of scriptural references which I believe address the crux of this argument.
"Do not conform to the pattern of this world,..." For the wisdom of this world is foolishness in God’s sight."
"As for you, you were dead in your transgressions and sins, in which you used to live when you followed the ways of this world and of the ruler of the kingdom of the air, the spirit who is now at work in those who are disobedient."
"You adulterous people, don’t you know that friendship with the world means enmity against God? Therefore, anyone who chooses to be a friend of the world becomes an enemy of God."
As sad as it is, commercialism of Christmas (including Santa Claus) is just one more tool of the devil to drive a wedge between believers and God. Every compromise, no matter how trivial it may seem, just serves to move "the world" further away from God.
God bless you.