Why we write " X'mas " for Christmas?

Because, in Greek, Christ is written "Χρήστος" (not sure about the third letter) and the first letter that looks like our "X" is pronounced a bit like the Spanish "j" or German "ch" or Scottish "ch". So, "X" became recognised as a symbol for Christ.

I think tosmtr4co is right.. I remember hearing people complaining about taking Christ out of CHRISTmas just for a short cut..... No short cuts here.....

Merry Christmas and The best New year to you

X is short form of Christ.

But I don't like to write that way. I hate those people who write Christmas that way. That is so .......

It was used as a "code" for Christians to avoid persecution. The "X" actually refers to the cross on which Christ died,. Early Christians used the "X" for the cross as opposed to the popular "T" form.

some choose to enjoy Xmas without believing in Christ. i think that we should get rid of Christ because the event is turning into more of a American tradition than a religious holiday

X is short for Christ.

I think it is because people did not want Christ in Christmas >.. I think It should be Christmas and nothing ELSE...

Short cut.

X is latin for Chi and that is how that came to be

the cross "x" of Christ