Who worships santa clause? - Nobody that I know of. Back to the original declaration that santa clause is satan - that's just silly. As posted by someone else, santa clause is a fictional character. Satan is quite real.
So, this is really just another bashing Christmas thread that will never work. First, there should be no assumptions about what Christians do who observe Christmas. Second, those who don't want to observe Christmas - don't and mind your own business. Hide, don't go to special church services, or whatever you feel necessary to do. In the meantime, all days belong to the Lord, including December 25th. Make every day Christmas, and there is no hint of a prohibition against it.
Matthew 22:36-40 KJV Master, which is the great commandment in the law? 37 Jesus said unto him, Thou shalt love the Lord thy God with all thy heart, and with all thy soul, and with all thy mind. 38 This is the first and great commandment. 39 And the second is like unto it, Thou shalt love thy neighbour as thyself. 40 On these two commandments hang all the law and the prophets.
Colossians 2:13-17 (KJV) 13 And you, being dead in your sins and the uncircumcision of your flesh, hath he quickened together with him, having forgiven you all trespasses; 14 Blotting out the handwriting of ordinances that was against us, which was contrary to us, and took it out of the way, nailing it to his cross; 15 [And] having spoiled principalities and powers, he made a shew of them openly, triumphing over them in it. 16 Let no man therefore judge you in meat, or in drink, or in respect of an holyday, or of the new moon, or of the sabbath [days]: 17 Which are a shadow of things to come; but the body [is] of Christ.
So, observe Christmas or not - your choice - just don't try to judge and condemn those who do. In other words, mind your own business and stop the Unbiblical judgment and condemnation of those who observe Christmas.