Parents teaching their children to be good because Santa knows if they’re good or bad is idolatry, teaching children to be good for Santa instead of God, the Creator of the universe. And Santa is a type of Satan, with his elves (demons). He has God-like characteristics. Lying to children is wrong.
Please don’t tell your children fables. Santa then becomes a type of god to them, whom they hold dearly. And when they finally learn he’s fake….