Earlier quoted context omitted.
To add to it, even the Christmas tree doesn't originate from Christianity. It was just adapted from a pagan tradition. The Santa Claus image was created by commercialism. The original saint Claus is celebrating on December 6 (or 7, don't remeber exactly) and that was a priest that anonymously was donating toys to children in orphanages and later was discovered. Easter Bunny is another commercialisation of a Christian…
IIRC the pagan origins of Christian holidays and symbols have their roots in making conversion more palatable for conquered Roman subjects. Christmas and Easter replace the solstice celebrations, the Christmas tree came from placing evergreen sprigs in the home during winter and the rabbit is a fertility thing.
The same is true, mutatis mutandis, of the retained (though radically transformed) Christian elements of consumerist celebrations like the modern American Christmas.