You have a problem with that. They are using the word Christmas, however, there are other holidays at this time of year. There are many Americans celebrating Hannukah, and I don't see them complaining that Target doesn't use the word Hannukah, exclusively. (Hannukah, btw, is the 22nd through the 29th.) If you don't like how the store markets this time of year, just don't shop there...they'll get the idea, but to believe a major retailer will cater to one religion w/out recognizing there are shoppers of other religions buying gifts at this time of year, is a bit naive, IMHO.
Jews make up only about 2% of the American population; Christians make up about 80%. Beginning to see the silliness of your “point?”