Soon, we'll hear RW Christians go on and on about saying "Merry Christmas" as if saying the words were enough to insure the presence of God.
I'm reminded of Jeremiah 7.4 wherein the Prophet says, "Don't trust in deceptive words, "the temple of the LORD" repeated three times, as if repetition guaranteed truth. All the words in the world could not cover the greed and violence of the temple crowd. No wonder Jeremiah described it as a "den of thieves," a comment to which Jesus himself alludes.
Also reminded of Jesus' comment on prayer: Matthew 6.7 - not to heap up empty phrases.
When Christians go about quietly celebrating the birth of Christ, that's all that's needed.
Say "Merry Christmas" if you wish, but say it without the hammer in your hand, or, for that matter, the gun.
As for me, I like saying Happy Holidays.