Dawkins is one of the scarier examples of thought police stasi troopers, however I do think Christians have a responsibility to tell their kids the origins of Santa Claus, since there is a very noble and model Christian saint behind the legend, St. Nikolaos, Bishop of Myra, who attended the Council of Nicea. He felt a special duty to the poor children in Anatolia and would leave gold coins in their shoes, seeking no credit or thanks for his generosity and kindness.
Even though I am not a Catholic, I would do a disservice not to tell my children about the wonderful life’s work of Mother Teresa. There are some really wonderful historical Christians, and it would greatly help children keep the faith into adulthood if we actively recognized their achievements and commitment to Christ.
Nicholas of Myra never was at Nicea. He is more imaginary than Godric Gryffindor.