Of course they do! Hallow's Eve pre-dates your ugly religion by thousands of years.hmmmmm seems like most every Christian I know celebrates halloween. I can't say the same for atheists when it comes to Christmas. Actually thats the time of year they start crying the most.
It's a tradition going back to the Druids (among other groups). It's a celebration of Fall Equinox, really.
Halloween trumps Xianity by quite a bit, in the Tradition department.