Are you agnostic about Santa Claus?
Technically, one would not need to be; since Santa Claus, or St. Nicholas, actually did exist.
He was St. Nicholas of Myra, patron saint of...well, many things, including children.
Wiki on St. Nick
The jolly fat man in a red suit, however, is more than likely fictitious. I think he was a marketing ploy, created by Coca-Cola
"The good Christian should beware the mathematician and all those who make empty prophecies. The danger already exists that the mathematicians have made a covenant with the devil to darken the spirit and to confine man in the bonds of hell." - St. Augustine
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