I'm speaking from my personal experience and that of the people in my life that I know. I'm also speaking to the general demographics of the United States. While there are no statistics on "lapsed Christians",
the percent of the population that reports itself as Christian is down 10% in the last 20 years, which certainly suggests a relatively high population of lapsed Christians.
Now, if you know Jews, Muslims, or Sikhs who celebrate Christmas for their kids and enjoy the secular holiday, then I'm really happy for them. Nevertheless, if they openly celebrate Christmas, they would fall under the "people I know who celebrate Christmas" banner, regardless of what their stated religion is. I hope you'll agree that not every non-Christian celebrates or should be expected to celebrate Christmas "for the kids."
So let me turn the question to you: what would you say to, or in the presence of, a person you knew did
not celebrate Christmas?