He comes down the chimney, which isn't practical since he is apparently really fat.
Cindy Lou Who: OK mommy/daddy, don't forget to leave out cookies and milk for Santa and carrots for his magical reindeer you told me about. I cant believe they can fly, pull his sleigh with his fat body and everybody on the nice list's presents and naughty lists coal!!!! Night night!
Santa Claus is a big LIE. THERE IS NO SANTA.
This lie is generally accepted in modern culture to brainwash kids, very similar to how Hitler's Nazi ideology was used to brainwash Germans.
Similar lies include the Easter Bunny and the tooth fairy.