Why not "Christmas"?

Christmas is often abbreviated to X-Mas.

Why? Is it a functional thing? An attempt at secularization?

I’ve never really understood why this is done.

lavendar room
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Except Record10Ti used X-Mas here. That’s the only reason I posted it in the general forum (aside from the fact that I don’t go into the L-Room).

Christmas is often abbreviated to X-Mas.

Why? Is it a functional thing? An attempt at secularization?

I’ve never really understood why this is done.
In early Greek versions of the New Testament, the letter X(chi), is the first letter of Christ (×ñéóôüò). Since the mid-sixteenth century ×, or the similar Roman letter X, was used as an abbreviation for Christ.