A most blessed Feast of the Beginning of the End of our Separation from God to you, and to your kith and kin!
Let us rejoice, today is born our Savior, Christ the Lord, the Word made Flesh, Son of God and Son of Man, I AM who comes to set his people free!
Oh, and by the way, don't worry about that whole "X-Mas" thing. It's kinda like when people trying to insult the Church use an upside down cross, forgetting that that is St. Peter's cross, so they're actually honoring the first Pope...
You know that fish thing with the strange letters? ΙΧΘΥΣ (ichthus) is the Greek word for fish. It also is an acrostic for this phrase: Ιησους Χριστος Θεου Υιοσ Σωτηρ (Iesous Christos Theou Huios Soter), which means "Jesus Christ God's Son Savior."
"X" is simply our representation of the Greek "Χ", which is the first letter of Χριστος - Christ.
Also, did you know that "Christmas" is a shortening of "Christ's Mass"?
And the Word became flesh and made his dwelling among us, and we saw his glory, the glory as of the Father's only Son, full of grace and truth.