Happy Holiday's vs Merry Christmas

I say Happy Holiday's.I not only wait on people from all over the world and don't want to offend any one but also there is an embarasment when I wait on these people as an american because of our envolment with these wars also that prison in Iraq.The detainees said our american soldier's would beat them untill they said they worshiped Jesus Christ.There are american's who get very upset with me because I say Happy Holiday's and get very smart mouthed when they say Merry christmas back to me.