Xmas as a major holiday is now a cultural celebration not a religious one, which is why so many non-religious and non-Christian people celebrate it, and some fundamentalist Christians object to the way it is celebrated.

Its major rituals today are not religious, they do not refer to Christ and you do not need to believe in any dogma to enjoy bright lights, Christmas decorations, tinsel, Santa Claus, Christmas carols, buying and getting gifts, Turkey and eggnog or the Buche de Noel or whatever particular foods are associated with it in any particular culture, the traditional movies, etc.

You have to be a pretty intolerant fundamentalist of some kind or other to object to its general celebration, and I don't think our society should bend over backwards to accommodate fundamentalists of any stripe at the expense of the majority.