I am sure that schools now are very different than when I was in school.
I went to public schools all my life, and have never been very religious though I consider myself spiritual. I remember when I was elementary school (between kindergarten to grade 5), we would get together in the school gymnasium a week or two before the holidays and sing Christmas carols together. The lyrics would be projected onto a large screen, and a teacher would be playing a piano and/or a guitar or another musical instrument for the musical accompaniment.
I especially remember "The Twelve Days of Christmas" because the grade five's always got to stand up and raise their hands when it got to "five golden rings."
Even though it might have been politically incorrect to sing Christmas carols in a public school, where many of the students are of different religions and backgrounds, as a child, I enjoyed this thoroughly. I didn't see it as a political anything, I just saw it as our school coming together at this special time, and find it sad that it's not done anymore.
So, even though, we are told that we should be wishing everyone a happy holiday to be politically correct, I prefer to wish people a Merry Christmas. It brings a warmer feeling to by heart at this special time of the year.
I hope you all had a very safe and Merry Christmas. I wish everyone all the best in the new year. May happiness find you and your family with many warm wishes from a chilly Canadian gal (moi!). Cheers!