The idea that you aren’t having a Christmas break by calling it “winter break” is disingenuous at best.
They should call it what it is.
Any student with a religious reason for missing school is excused. This isn’t new.
If you have a critical mass of a given religion, then it makes sense to have the entire school take the day off.
We didn’t have Jewish kids, let alone Muslims, when I went to school, so we didn’t have Yom Kippur off. If we had a sizable minority, then we would have. It has nothing to do with the state “recognizing” a holiday. They are recognizing reality.
More than once my daughter’s district has hinted at opening on Good Friday to make up snow days. They never have because enough parents respond “I’m not sending my kid to school on Good Friday.”
If enough kids don’t show up, it doesn’t count as an official instruction day. So it’s a fruitless effort.
Many years ago, when my son was still in public school in Texas, the school board officially called the two week break at the end of December as the “Winter Break” - I doubt there was a muslim within 100 miles of our town. Of course we all called it Christmas break but officially it was the “winter break”