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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Christianity didn't come into existence until after Jesus' death (I'll let someone else debate the existence of his miracles). I'll throw an estimation of about 150 AD but some history book's probably got a more accurate number. Anyway, Bible has been revised many times since its inception, so maybe there's something missing in the tale. I don't trust the King James version very much, but it's the one everyone cites.