I agree with the CCC’s definition of lying. However, here I think is the point of contention:
Most parents would never say they are intentionally deceiving their children. Yes, Santa Claus is not real. Neither is the Ugly Duckling, Snow White, Rumpelstiltskin, or (according to the notes in my New American Bible, so take it with a grain of salt) the Books of Tobit and Judith in the Bible.
BUT people tell their children these stories not because of the verity of the situation, but because of the underlying moral truth. Santa, for example, teaches us that generosity makes others feel good, and when we are generous, we feel pretty good, too. Also, we ought to behave, or else we will not be rewarded.
In the words of G.K. Chesterton, “Fairy Tales are more than true; not because they tell us that dragons exist, but because they tell us that dragons can be beaten.”
HOWEVER, given the special situation of Santa - in that he’s no longer just a mythical figure, but almost the central figure, tantamount to the Baby Jesus, of the non-Christian “Winter Holiday”, I can certainly understand your and others’ feelings. And Santa must be made the servant of the Baby Jesus. Something like this:
http://2.bp.blogspot.com/-q4wsqzr6n...FNyrE/s400/Santa+kneeling+over+baby+Jesus.jpg
I don’t think it is sinful to tell children about Santa. But unless we relay it back to Jesus, it will be counterproductive to developing healthy Christian faith.
I also see nothing completely wrong with telling our children about Santa because, in a way - not the way atheists make it out to be, though - he is analogous to God.When we were young, we used to believe God really was a big, old man with a long white beard (as the atheists would make Him out to be). That was because we could not understand or accept God in His true form. Most of us still can’t understand God’s infinity or being outside of the universe. But we can accept it.
Yes, we could understand Saint Nicholas as he really is when we are children. But I don’t think children much understand the wonder of Heaven, when candy and toys are so much more entertaining here and now, much less the power Saint Nicholas has when he’s not on Earth physically anymore.
Santa Claus, if we as Christians wield him properly, can segueway into Saint Nicholas, just as the “old guy in the clouds” can segue into the infinite, eternal, living God. We can use things that children grasp easier to lead them into deeper truths. It would also make the transition from “Santa is real” to “We lied to you” much, much less jarring, and it still leaves the kids with something to believe in, that is real.
I do believe teaching kids Santa is real and then telling them he is not is a very bad idea, analogous to telling kids God is a big, powerful man in the sky and then telling us He doesn’t exist.