The abbreviation Xmas for Christmas dates from the mid 16th century. The X is the Greek letter chi, the initial letter in the word Χριστός ( Chrīstos ) “Christ.” In spite of a long and respectable history, today Xmas is offensive to many, perhaps because of its associations with advertising.
These are graphics I have found on Google. I make animated images and have been picked out as the best by some websites. These are not my creations. I do take credit for picking them out. My three accredited certificates in graphic design come in handy when picking out great art on the internet.