My perspective on Christmas is not as it once was. The Bible teaches nothing of it and, consequently, we do not observe it as a religious holiday (as a family or even as a church). However, I do not preach against it; at most, I might malke a remark about it, but nothing more. When asked in Bible class, I will comment on it at whatever necessary length I feel I need to go.
Generally speaking, in my little corner of the world (a rural area), Christmas is positively thought of (greatly). I simply take opportunity to speak about the Lord’s death and the life we are to live as a result of His death.
Perhaps I am an infidel by some standards of thinking!