When people claim that somehow this time of year means one thing and only one thing and has since "day one" (in this case the birth of Christ, allegedly), then no, history is not irrelevant, and it is not "may" belong in part. It is abundantly clear what the history is. Good, bad, indifferent or some combination thereof, it is the reality. There is also a remarkable overlap between those who pretend it never happened and who take offense to phrases like "happy holidays" and have "Keep Christ in Christmas" stickers adorning their cars. (Never mind the irony that "holiday" is a derivation of "holy day.")
Context and history do matter in this world. The history of any religion matters and shouldn't be forgotten. Since this is focused heavily on Christmas, the Christian church, myself included, do not just get to pretend the atrocities committed in the name of religion over the years happened just because they were long ago, either. Things can and do evolve and change, at least hopefully for the better, but to whitewash and ignore the truth of the past? Nope. Not having that.