Christianity and Christmas have lasted for about 2009 years now (historical say Jesus was born around 6 A.D), so why should 700 years change anything?
Seriously, sound better and find a smarter excuse
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Christmas did not come into existence until the 4th century prior to that it was called saturnalia and it was a widely celebrated thing it is pagan to its core and has nothing to do with the messiah in the bible.