The abbreviation Xmas isn't irreligious. The letter X is a Greek abbreviation for Christ.
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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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One town in Indiana is called Santa Claus. There is also a Santa, Idaho.
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Christmas trees become popular in the UK from 1841 when Prince Albert erected a tree in Windsor Castle following a German tradition. Fir trees have been decorated at Christmas time in Germany since the 8th century.
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The poinsettia is a traditional Christmas flower. In Mexico (its original birthplace), the poinsettia is known as the "Flower of the Holy Night".
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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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Rudolph the red-nosed reindeer was invented for a US firm's Christmas promotion in 1938.
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