* There are certainly more plausible explanations of how those presents got under the tree.
* It is unlikely that one being could visit every child's home in a single night.
* Nobody has ever seen his dwellings.
* There is a reasonable amount of evidence disproving his existence.

* People told you he was real.
* All your friends thought he was real.
* There were books written about his life.
* Your parents said if you didn't believe in him you wouldn't get any presents.
* You never bothered to think about other ways those presents could have appeared under the tree.

* People tell you he is real.
* All the members of your church believe he is real.
* There are books written about the life of Jesus.
* The bible says if you don't believe in him you won't go to Heaven.
* You never bother to think about other ways humans could have come about.

BUT!!

* There are certainly more plausible explanations of how humans came to be.
* It is unlikely that one being could have created the entire Earth in a single week.
* No sane person has ever seen a Heaven or a Hell.
* There is a reasonable amount of evidence disproving his existence.