Is it true that you cannot say "Merry Christmas" in the USA?

Well, you can't say hoo-ho-ho in Australia, which is similar.

Huh? Reading trough the comments I gotta ask:
You mean people still associate Christmas with Christianity? Ok, so the names sound similar and there is an origin thing involved, but last I checked Christmas was a family holiday where people tell their kids that a fat guy in a red coat and big white beard brought them presents from the north pole. While I don't give a shit enough to read the bible, I'm pretty sure that isn't in there.
By that logic is saying "Happy Easter" also seen as "offensive"? :P

This should answer your question.

To any reasonable person, anyway. There are some jerks who like to make a big deal out of it.

Wow, I have never been so offended in my life..

Yeah. They get really offended when I say "Merry bloody Smissmass" and turn their heads into bombs.
Some people, eh?

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I'm Muslim and I say screw anyone who gets offended. It's your holiday and celebration not theirs so F them. If they don't want to be greeted they should stay at their homes and not calling anyone or even answering the phone or the door. Hell, they shouldn't even go online nor watch TV.
Merry Christmas SteamGifts community .

True, but they can say something better, more patriotic. 'MURRI CAristmas. And celebrate it with shooting some ".38" democracy in the air.

Just say happy Burgermas

Merry cAPITALISM.

In America we are so afraid of offending the whiney minority that we can't use religious terms. This seems to mainly effect Christians. This seems to have gotten much worse under our current president.

you can say whatever you want, but "happy holidays" its more polite and inclusive

Festivus for the rest of us!

you have been watching Fox "fake" News?

Happy Saturnalia!

It depends on where you live. USA is a huge country. The south is typically more religious than the north. I myself have never witnessed someone getting upset when someone said "Merry Christmas", but have seen news articles online about it. Mostly it seems to be about holiday decorations on government property like courthouses and the like. But in general, I'd say it's no big deal to the majority of people.

Also, in case you wondered, we don't all carry guns either. In fact, I myself have never touched a gun in my life. The only guns I have seen have been on the police, holstered. I've never seen a gun pointed at anyone, nor heard one go off (well, except for hunting guns I've heard off in the distance when in the country).

It doesn't matter if you say "Happy Holidays" or "Merry Christmas" Help me, I'm getting butt raped now for spreading lies

You can say whatever the fuck you want, and if anyone gets offended they're worthless sacks of shit.

You can still say Merry Christmas if you want to. It's just you gotta be careful who you say it to because some people have some serious sticks up their asses and get offended at the dumbest things. The very large majority of us will be happy with whatever well wishes you want to give.

The CIA torture of Muslims occur in secret prisons. Therefore, I think that can say "Merry Christmas".

If someone is offended by you wishing them a merry xmas, just apologize : "I'm sorry, I didn't mean to offend you by wishing you a merry xmas. I hope you have a horrible time in december"

You can say Merry Christmas, however most businesses don't want their employees from saying it, because they don't want to offend customers, but it isn't illegal, I even had the Domino's Delivery guy say Merry Christmas to me.

No it's not, stop watching Fox News.

Well, whatever it is, you always can say; "have a nice week" or "my best wishes for you in this epoque". With these words you can go wrong, i guess...

Merry Winter Sale sounds better anyway.