I get where you are coming from, but I find holiday decorations to be one of the highlights of an otherwise crummy season.
Winter is so depressing. It is cold and dark all the time. It is fun to come home to a bunch of silly lights everywhere. I leave mine up for a few weeks past Christmas. If you ask me, the tree should stay up until the first day of spring.
It doesn't have to be a religious celebration. Just copy the USSR and celebrate the parts of Christmas you want (putting up a tree, gift exchanges) on New Years.