I've never understood people who get insulted over "Merry Christmas" or "Happy Holidays." The fact that we spend soooo much time thinking about this is kind of silly.
If I know that someone else is of a different religion, I will respect their religion and wish them a Happy '[insert here]'. However, for the most part I say "Merry Christmas" because I am Christian and Christmas is the holiday I celebrate. I am ALWAYS accepting to people of other religions, but, where do we draw the line at being respectful of other cultures before you allow your own to disappear? If you meet somebody and they don't agree with your personal beliefs, are you all of a sudden going to change your beliefs just to please them? It's just too much always trying to please everyone. In addition, saying "Merry Christmas" isn't disrespectful to anybody nor does it inflict your religion on them.
Furthermore, if we were all truly sincere, respectful, and tolerant of each other, it wouldn't really matter what you say. If love and honest is
present, who cares which words you use to express it?