Let me rephrase: The salvation of Christ and the redemption of sin that He offers, is available to all. Christmas is the day on which Christians celebrate the birth of the Savior of mankind, and this is good news for everyone on the planet.
More accurately, you believe this is good news.
Quite a few Jews, due to the unfortunate past behavior of "Christians" towards Jews, see little good about the news of the birth of the person who founded the religion that persecuted them for over 1500 years.
I of course do not hold Christ himself responsible for the behavior of some who claimed to follow him, but I have known Jews who did.