I should start by stating that I was borne and raised as a WASP, but haven't done the religion thing for half a century. Our children and grandchildren all also raised as Christians, but as kids are all scientists, hardly religious dogmatism in our family. My side has only been in Canada for maybe 150 years, but my wife's side goes to Selkirk settlers (her Father) and also back unknown thousands of years on this continent (Mother). Even though we are barely-to-not-at-all religious, we celebrate and appreciate Christmas as a very Canadian public holiday. It wraps up the year with a very commercial habit of gift giving - and since our job is to spoil children and grandchildren, we dig in and do our part.
My two most memorable Christmas eves/days were one in the '80s when I was travelling into a war zone with my handler in a Muslim part of West Africa. We had spent the day with our in-country partners but were out in the Sahara on our own that night. We pulled into a roadside inn, checked into our rooms and received a knock on the door. In very broken English, we were invited down to their restaurant/"bar" (yes, there are places in Muslim countries where alcohol - mostly locally brewed beers - are served). They explained that since we were the only Christians anywhere within hundreds of klicks, they wanted to make us welcome and recognize OUR cultural/religious event. We spent a delightful evening been educated in Saharoui customs and lore. Though neither of us were actually Christian, we were touched by the sincerity of our hosts to respect what they assumed to be our belief. It was also the only Christmas I ever missed with my kids. The second was a visit with my business partner when we first opened up an office in Guangzhou in the early '90s. Even though China was barely out of its isolation (few citizens were allowed to travel and VERY few outside of the country) the newly built retail "malls" (very veritcal development) featured a lot of Western goods that few could yet afford, but most notable was the proliferation of Christmas decorations in a city with precious few Christians of any stripe.
Christmas is more than just a Christian/pagan religious celebration (and even that part is the lesser of the whole). It is a globally recognized celebration of people's good wishes for their fellow man. That is, anywhere but in downtown Hogtown it seems where anything that promotes goodwill towards men is gauche.