There's a point where people think that the Commercialization of Christmas started, and that it's always about 10 years before they started thinking about it. I remember reading Peanuts comics in the 70s, with Linus & Charlie Brown complaining about it. But Tom Lehrer sang about it in the 60s. Stan Freberg satirized it in the 50s. (Hat Tip: Music You (Possibly) Won't Hear Anywhere Else)
Ah, well, the 50s were the Organization Man and the 60s were decadent, so what could you expect? Now, the 40s, there was an earnest decade. Really? White Christmas? Meet Me in St. Louis? It's a Wonderful Life? They may be all about community and family, but not much about religion. Go read through the whole set of Dickens's Christmas Stories, and tell me where religion shows up. ("God Bless Us, Everyone" could as well be Thanksgiving, if the English had Thanksgiving.)
The Puritans banned celebrating Christmas because they thought the celebrations were frivolous.
Ah, I hear you cry, easy to say this about someone else's holiday. What if it were you own? Well, it is. People know about dreydles & latkes but forget about the confrontation with Greek culture. Next year's Purim slogan should be "Putting the 'Haman' back in '
The problem isn't that Christmas (or any of the other holidays) are trivialized, but that they're infantilized. Tha we substitute the form for the content doesn't make the form irrelevant. It's one thing to get trapped by the things we do to celebrate, but it's still ok to enjoy them.