When I was in elementary school I had a Jewish classmate (I was way ahead of Vatican II in interfaith dialogue) whose parents celebrated Chanukah/Hanukkah as well as the secular side of Christmas with Christmas trees and secular Christmas (or is it Xmas?) decorations and most importantly exchanging Xmas gifts!
I was so jealous as he got both Chanukah and Hanukkah gifts and Xmas gifts! Yes! I was guilty of the deadly mortal sin of ENVY!
But I digress! How do you spell the Jewish and Christian holy days or is it holidays? O my! How do you spell that?
And if Jews can celebrate Xmas why can't Christians celebrate the Festival of Lights?