a time when many family members, including your great-great-aunt that you haven't seen for 12 months, all gather together to get stuff and eat food. whether you celebrate it for the religion or not, it's still nice to get presents. we're humans, we're greedy.
i hope i don't have to see my great-great-great-great-great-aunt-mary for christmas. she always makes raisin cookies that taste like raccoon fur.