why do they call christmas xmas

Well, some people say it's just a short way of saying Christmas, but others believe it's because the original word "Christ" has been removed and replaced with an "X" as a way to淡化宗教含义，使节日更世俗化。不管是什么原因，Xmas这个词在英语中仍然很常见，而且大多数人仍然理解它指的是圣诞节。