Actually, Halloween can trace its roots back to Celtic legends which may have also been shared by the medieval Catholics that say that on Halloween, the barrier between the world of the living and the world of the dead is at its weakest, allowing ghosts to be seen by living people. Basically Medieval Europe’s version of Day of the Dead. Also, Halloween’s name comes from ‘Hallow’d E’en’, or ‘Hallowed Even(ing)’, because November 1st, the next day, is All Saint’s Day for the Catholics. So long story short, Christianity actually helped shape Halloween, an innocent spooky holiday that’s clowned by people with sticks up their asses.