Funny information: "Halloween" is a derivative of the holiday "All Hallow's Eve", which was a three day christian holiday to commemorate martyrs and past believers.
The holiday ended up colliding with another pagan holiday, "Samhain" of the same period, but a different region, and was overtaken by All Hallow's Eve. Later on, some societies started to readopt the Samhain celebrative concepts and "Halloween" turned into a dark holiday.
It's initial traces are still a christian holiday, but according to Christianity, the Satan successfully corrupted it into what it is today.
A bit off from what those of Heaven would promote, this is still interesting!