Oh, I know not very many people will like me after this posting.  I may  even receive my first hate mail.  But I'm passionate about sharing  truth.  Before I get started on the Santa Claus issue, though, let me  make a disclaimer:  this post is directed to those who profess to  believe in God of the Bible and who profess to follow the Jesus that  Christmas celebrates.  If you are not a believer, you are "free" to  believe what you wish...although I pray that you may come to know and  embrace Truth.
Okay, now that we've got that out of the way, let  me get to the heart of the matter.  This is another truth that hit me  hard as I was listening to some Christmas carols recently (I am getting  beat up quite a bit this holiday season, but it's all good).  We all  have heard this one, right?
"You'd better watch out, you'd better not cry,
You'd better not pout, I'm tellin' you why,
Santa Claus is coming to town..."
So far, so good.  I don't see any problems with a big, fat guy in a red suit coming to town for a visit...
"He sees you when you're sleeping;
He knows when you're awake.
He knows if you've been bad or good,
So be good for goodness' sake...."
Whoa.  Let's hit the pause button for a second there.  
What kind of qualities are we attributing to this jolly, old fellow?   I have listened to this carol for years, and I guess I never really  grasped what we've turned the Santa Claus figure into...until now.  It  seriously disturbs me, especially when I start to hold it up to the  light of God's Word.  Now I can almost see the eyes starting to roll and  to feel the indignation pouring through my computer screen as people  read that last statement.  What's wrong with Santa Claus?  He's just a  harmless little thing, and you're out to spoil it for all the little  kids.  I know, I know.  I'm trampling on some supposedly sacred ground  here.  But is this belief in Santa Claus a truly harmless thing,  especially for those who claim to believe in God?
Let's take a  look at the first claim in this Christmas carol:  "He sees you when  you're sleeping; he knows when you're awake..."  Huh, that sounds pretty  similar to what I read in Psalm 139:1-3:  "O Lord, You have searched me  and known me.  You know my sitting down and my rising up; You  understand my thought afar off.  You comprehend my path and my lying  down and are acquainted with all my ways."  Now, did you catch that?   Read it again s-l-o-w-l-y.  This carol highlights some essential beliefs  about Santa Claus that put him on equal footing with God.  Think about  that for a second or two.  I don't know how Santa Claus feels about  that, but I DO know how God feels.
"I am the Lord, that is My name; and My glory I will not give to another."--Isaiah 42:8
In other words, God is not about to share the stage with anyone.  Not even Mr. Claus.
While  you mull over that, let's take a look at Santa's second claim to fame:   "He knows if you've been bad or good, so be good for goodness' sake..."   Again, this idea sounds familiar.  Jeremiah 17:10--"I, the Lord,  search the heart, I test the mind, even to give every man according to  his ways, according to the fruit of his doings."  So here we have both  Santa and God making a judgment on a person's behavior and rewarding him  accordingly.  I'm not really sure where Santa draws the line between  good and bad.  In the movie "A Christmas Story", the main character  abandons his friend in an emergency, beats up a bully, curses, and lies  to his mother (about where he learned the curse word).  He wonders all  along if he will be able to get the present he's requested.  Christmas  comes, and the present is there.  Whew!  He made the cut apparently.   God's standard, on the other hand, is written out very precisely in the  Bible.  He  doesn't leave us in any suspense about where we stand:  we've ALL failed 
His good/bad test.
"As  it is written:  'There is none righteous, no, not one; there is none  who understands; there is none who seeks after God.  They have all  turned aside; they have together become unprofitable; there is none who  does good, no, not one.'"--Romans 3:10-12 and Psalms 14:1-3
No wonder Santa is so popular.
Having  said all this, I come back to my earlier question.  Is believing in  Santa Claus truly harmless?  As believers is it something that we can  teach kids and expect that they will outgrow or leave behind at a  certain age?  I don't think so.  I read 
an article back in August  that referenced the National Study of Youth and Religion.  In the study  teenagers who identified themselves as Christian had a hard time  articulating their beliefs.  Could this difficulty come from confusion  between Santa Claus and God?  I don't know for sure, and I'm not sure  that the study even goes there.  It does make me wonder if there isn't a  connection, though.  The Bible is very clear about not mixing other  stuff in with God.  In the spirit of Hebrews 3:13, I encourage my fellow  believers in the body of Christ to seriously consider this issue and  seek the Lord about it.
"Now  therefore, fear the Lord, serve Him in sincerity and in truth, and put  away the gods which your fathers served on the other side of the River  and in Egypt.  Serve the Lord!  And if it seems evil to you to serve the  Lord, choose for yourselves this day whom you will serve,..."--Joshua  24:14, 15a