Do you prefer 'Merry Christmas' or 'happy Xmas'? A controversial question - it is likely to divide many. For some, Christmas is the only correct name for the holiday, but others will happily use Christmas and Xmas interchangeably.
However, not everyone is familiar with the etymology behind the words - and some make their pick not knowing the difference between them. If you fall into this latter category, you aren't the only one.
Lots of people are only just learning about the different origins behind the two terms. At the same time, others are just realising that both hold religious meaning, contrary to the popular belief Xmas is a secular version of its longer counterpart.