Christmas is a reminder about what the Bible calls the narrow way to eternal life; aka: heaven. It's really offensive to those who would rather blaze their own trail... but the offer is still on the table for even those people while they still have breath in their lungs. Congress proclaimed Christmas a federal holiday (Holy Day) in 1870. As a nation we have chosen to take a day off of work to commemorate the birth of the narrow way; aka Jesus Christ. Pastor Stephen Furtick has written a short article with good insight on the narrow way Jesus saw the world. Read it here.
I haven't read his book yet... but I'm going to soon. I'm sure it's great. Look at all the positive reviews it has on amazon: