As a Christian, I agree with Dawkins that the myth of Santa Claus can be harmful to children.
Then hopefully you never read them fairy tales or took them to see movies about princesses and talking cars.
Children's imaginations are limitless and Santa brings them happiness. I told my kids when the time came that Santa teaches a valuable lesson of giving anonymously. Instead of parents having their kids suck up to get presents then have to be grateful to parents for their presents, they have Santa who gives freely and asks nothing in return.
Just as Jesus gave all and asked nothing in return.