With all due respect for you and your Master of Divinity degree, but didn't the early Christian church use "X" for Christ? And the term "Xmas" is not some new marketing term...it has been used for a long time by Christians.
In fact, maybe this points to a different problem...perhaps people are not learning enough about the Church's history when they're in Sunday School or woshipping (and yes, learning is appropriate in worship, IMHO). Otherwise, they might be wearing "'X' Marks the Spot" t-shirts and everyone would give a knowing nod to a fellow Christian. Or do you favor allowing anti-Christian atheists to co-opt the term Xian, like they have?
I've studied Greek for well over thirty years.
Why do you think I object to "Xmas"?
Dan