Most Atheists use it as a gift-giving holiday.

I've met very few people, Christians included, who actually celebrated it as the birth of Christ. They just do gift exchanges, too.

I have celebrated Hanukkah with a Jewish family once. That was very interesting. My father dated a Jewish woman for about a year or so. Very religious. Never tried to convert us. They had some interesting ways about them. I was like 10 or 11, I don't remember much. I remember potato pancakes, I remember they got lame presents every night for seven days (or nine? Whatever it is). It's not like multiple Christmases. Whole different holiday.

We mainly use it to exchange gifts.