ISIS is wrong, Halloween is just kids having fun. It really doesn't matter where it originates from. Currently people seem to enjoy popping on a costume, spending time with the family carving pumpkins and eating sweets.
I'm Christian although it seems I'm a terrible one as dc aren't attending a "light party"- which appears to be many churches' way of making money out of Halloween, and we'll be giving trick or treaters sweets when they knock.
I can't help feeling heaven is going to be full of dull kill joys.