Mildly Infuriating

Maybe, but Christmas (as in the day of, December 25th) is still a Christian holiday. It's a pretty safe assumption to make that the majority of people celebrate Christmas, especially the commercialized version that's ingrained into our culture, but it's still an assumption made with Christianity as the default/majority that doesn't take into account anybody else. Unconsciously assuming everybody is one thing because the majority of people are that thing can silence/oppress those that aren't.

This is why the big stink every year over Merry Christmas vs Happy Holidays is inherently antisemitic/anti-other religions. Because it refuses to acknowledge that there are other people in this country who practice other religions with other holidays (or don't practice any religion at all). If you make an exception for one (making Christmas a federal holiday), but not for the other (Passover in this case), then they're being treated unequally and therefore you don't have freedom of religion and are biased against the second one. Because the followers of Judaism in that example cannot practice their religion and celebrate their holiday to the same degree as Christians can.

For true equality you either accommodate all religions by making every single religious holiday a federal holiday or you accommodate none of them. Obviously, the first option is impossible, so you limit federal holidays to days of importance outside of religion, and allow enough vacation days to ensure people can celebrate at least most of their holidays. Days like the 4th of July, voting day(s) (a big one that we don't do), etc should be federal holidays, but not Christmas or Easter. Outside the government, this is how it's handled. Businesses are free to choose what holidays they close to celebrate or stay open for, and cannot get in trouble for what holidays they decide to give off or not give off for their employees. This is why the Jewish and Chinese communities are historically so close in the US - neither celebrates Christmas, so Jewish people go to Chinese food restaurants and other Chinese businesses that would otherwise not get much business on the holiday. It's also why retail stores can make their employees work on Christian holidays, regardless of whether or not they're Christian (speaking of which, you never hear an outrage about people being forced to work on Christmas day, yet there's a guaranteed frothing of the mouth over the Happy Holidays thing every single year).

That's the antisemitism inherent in our culture. That people are willing and want to support allowances for Christian religious institutions and values like holidays and prayers in school, but would not be okay with the same allowances for Judaism or other religions. In the same way that the architect I mentioned making the bridges too low so black kids couldn't go to the beaches near his house was an act of racism.