This person has a fine enough point, I'm Jewish and I don't care if people celebrate Christmas. Hell, I went and saw Elf with a chick a coupla years ago in the theater and it made me feel just as warm and fuzzy inside as anybody else.
But it disappoints me that a Jew would use that "america is a Judeo-Christian culture" line. The only people who say that are right wing politicians, or any other Christian type folks, who are trying to shove their Christianity down everybody else's throats and want to make their beliefs seem more diverse.
No Jew who truly identifies with the religion and the culture of judaism that hasn't been coopted by too much christian evangelism in this country would never use that "Judeo-Christian culture" nonsense to describe the country. This is a Christian country. The only thing Jewish about it is that Christianity happens to like the first 5 books of our particular religion too.