Paul says every day is special, because created by God. We can honor all of them, or pick out a few, according to our personal preference. C. Holidays should be holy. God wants obedience more than mark on calendars. They are pointers to God, not idols.
Holidays can turn to legalism.
Returning to God's perspective. But I should hope Christians would want more than just that. And as Christmas becomes more and more secularized, I am not sure they get it. Originally, Easter is what really mattered. Only in the 1800's, with a push from store owners, did Christmas take off.