A celebration of the birth of the son of God, a member of the Holy trinity, seen as the savior by the Christian faith. Arguments can be made that many of the activities surrounding it were hijacked from pagan rituals and corrupted by capitalist desire to make money (i have no problem with this but it's what happened) but Christmas is very much a Christian holiday. Labor day is secular.

Then tell the world a huge amount of people have been celebrating Christmas, or Weihnachten, wrong for years.

So your argument is the fact they use a different name but it is still a celebration of the birth of christ? No that's not religious at all.

No, but a lot of people don't give a shit about religion and still celebrate Christmas, Weihnachten, or whatever you may call it, because or its meaning. Try finding a non-muslim who celebrates Ramadan

My contention would be those people arn't celebrating christmas. You can give gifts hang stockings and put up a tree, doesn't mean your celebrating christmas whether you call it that or not. Since all those traditions were taken from pagan rituals, you are celebrating those. If I decide to fast during the same month as Ramadan but it has no spiritual meaning to me, am I celebrating Ramadan? No that's absurd. Just because you take actions mimicking a religion without following the meaning behind it does not negate the fact it is still a religious holiday.