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There was a family of messianic jews in my church. They taught us some interesting things, There teachings were scripturaly sound. As for Christmas..it is not biblical..it is a man made tradition
Sure, there are a lot of traditions that some people, non-Christians and some probably well-meaning but misguided Christians, celebrate that are not Biblical. For example:
Tree with colored lights -- Pagan tradition
Mary giving birth in a cattle shed, because there was no room at the inn -- Biblical (Luke 2)
Magical fat man in red suit who rides a sleigh pulled by flying reindeer and slides down your chimney to give presents to good boys and girls all over the world on Christmas Eve -- Pagan
St. Nicholas, a martyr who lived in the 3rd century, who loved children and gave them gifts for no reason but that he loved them -- Historically accurate, as far as we can tell.
Shepherds visited Jesus at his birth -- Biblical
Three wise men visited Jesus at his birth -- mixture. The Bible speaks of wise men (Matthew 2). It doesn't say how many there were. We assume 3, because there are 3 gifts. There might have been 4, there might have been 2. (It's plural, so all we know is it's more than 1.) There might have been 100 (though that's a bit silly). It's also pretty clear from the context that this happened some time after the birth narrative -- Jesus may have been about 2 at the time, though it doesn't say with any specificity, we do know it was some time after Jesus was born.
So there are certain aspects of a "traditional Christmas" that are man-made, but to say that "Christmas" is not Biblical is flat-out wrong. Read your Bible, Matthew and Luke, and you'll see that the story of Jesus' birth is right there. Why should we not celebrate with the Angels, "Glory to God in the highest!"