Christmas vs. holiday advertising question?

I am starting a business in the United States and many have told me to use "holiday" in place of "Christmas" when advertising for the Christmas time. I am not originally from the U.S., so I'm not really getting this concept. Why should "holiday" be used? I thought America was Christian country? What should I use for best profits? Thank you

Christmas vs. holiday advertising question?
The US is predominantly Christian, and yes Christmas is celebrated as a religious holiday. However, there's a clusterf'k of religions that have also joined winter festivities by coming up with their own reason to yell and cheer and feel self-important. Kwanzaa worshipers, the Jews, and any other self-respecting religion tries to get on the holiday bandwagon, too. Remember, you can sell stuff to them, too. Saying "holidays" opens up your market to a greater audience. Stick with holidays if you want to sell to everyone. Stick with Christmas if you just want to appease Christians. I, personally, am an atheist.
Reply:I am Jewish, but even I find that term "happy holidays" annoying. I much prefer an honest Merry Christmas, than and business imposed holiday. I expect only friends and family to wish me a happy Hanukkah. Who is Santa Claus? Should he cry out, Happy Holiday to all, and to all a good night. Give it a rest.
Reply:If you only want to sell to Christians then say Christmas. There are all sorts of people here with all religions. I say you should say whatever is appropriate for you and your beliefs. I told one of my Jewish clients, Happy Holidays and he laughed and told me Merry Christmas. The gist of it is that some people prefer to say holidays so that no one is insulted. I think we need to be tolerant of all religions and that if I say Merry Christmas to you and you are not Christian, please take it in the spirit it is intended, not as an insult. And I think most people think as I do. . .but then I'm not selling anything.