The twelve days of Christmas are the days between Christmas Day and Epiphany (6th of January) and represent the length of time it took for the wise men from the East to visit the manger of Jesus after his birth.
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Coca Cola was the first beverage company to use Santa for a winter promotion.
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Many theologians estimate that Jesus wasn't born on December 25 but sometime in September between 6BC and 30AD.
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At Christmas, it is traditional to exchange kisses beneath the mistletoe tree. In ancient Scandinavia, mistletoe was associated with peace and friendship. That may account for the custom of "kissing beneath the mistletoe".
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The abbreviation Xmas isn't irreligious. The letter X is a Greek abbreviation for Christ.
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Rudolph the red-nosed reindeer was invented for a US firm's Christmas promotion in 1938.
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