Now ignorant me asks, what else?
Um, really? Well, Chanukah is the most obvious--it's from Dec. 20-28th this year.
A few years ago, Ramadan was around Christmas, but I just looked it up and it was in the summer this year. Kwanza is mostly an American holiday, I think, and I'm not sure how many people actually celebrate it. Diwali meanders through the year, also, so it is sometimes around Christmas, as well. This year it was in October, though. A significant minority celebrate solstice as well.
But then there are the people who simply don't celebrate any religious holidays and don't like people assuming that they do. Some people really can't stand Christmas, and while I'm not among them, I get why--it's commercial and forced. The broader culture is yelling at you "YOU HAVE TO FEEL GOOD RIGHT NOW, OR ELSE YOU'RE A SCROOGE!! FEEL GOOD!! EVERYBODY FEELS GOOD NOW!!! BE HAPPY!!! HAAAAAPPPY!!!!!" What must that feel like to somebody who is depressed? Or who just had a really bad year and needs to just let themself feel bad for a while so they can move on? Well, the clock just ticked "jolly time," so now they're a failure at the biggest holiday around, too!
So,were did my rambling get to. Basically, not everybody celebrates Christmas, and treating everybody as if they
should gets annoying. It's aggravating and upsetting to people who just don't celebrate religious holidays; it forcefully marginalizes all religious non-Christians; and it
specifically marginalizes Jews who have their own holiday going on at the same time most years, and Hindus and Muslims on years when they also have their own holidays going on.
But really, "Happy Holidays," was probably not originally intended to be a recognition of Chanukah, Kwanza and others, but as a shortening of "Merry Christmas and a Happy New Year," so people turning its use into a "war on Christmas," is a little ridiculous.
What I like about "Happy Holidays," is that it leaves it open to the person receiving the message to fill in what they want. Don't like Christmas? Well, have a happy New Year, anyway!