Is it wrong to lie to my children about the existence of Santa? When they get older how do I explain to them that I was lying? How can I expect them not to lie when I confess to them that I had been lying about Santa's existence?
closed as off topic by Caleb♦, Flimzy, El'endia Starman♦, JustinY, Cryst Sep 7 '11 at 21:58
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Perhaps the question really is, "Should I lie to my children?" or "Should I lie?" The answer to both of those is, of course, "No."
Certainly it is culturally normative to tell children about Santa. However, right and wrong in Christianity are not determined by how acceptable it is to a culture.
My parents told me the gifts were from them, and I appreciated them for it--not some mythical being. Christmas for devout Christians is a remembrance of Jesus and not the celebration of fairy tales.
Tell them about St. Nicholas the Bishop of Myra and then tell them that it's an old tradition. Then have more traditions so this one tradition doesn't end up being the only thing they remember from their childhood.