Because it's extremely over-commercialized.

Anyways, I think the author is taking tid-bits of circumstantial evidence from both sides to support his theory. I don't see where the injustice is if you see menorahs, crescent and stars, and christmas trees in city hall. I don't see any injustice is if there's some special muslim dinner during rahmadan if there's a special dinner during christmas.

And as far as "Judeo-Christian" culture goes (no offense booty and the rest of the jewish folk here), I have not seen any significant jewish influence in american culture. If I were jewish, I'd take the the phrase "america's judeo-christian culture" as an insult.