Witches, skeletons, graveyards, effigies hanging from trees with purple colored heads.
It’s not all cornstalks and smiling jack o’lanterns.
Well, with all respect, I wouldn’t want to live in a world where we didn’t refer to these things and ‘whistle past the graveyard’ over them.
Your fear over something as innocuous as Hallowe’en seems to me like the primitive and superstitious mindset that resulted in the murder of thousands of (innocent) ‘witches’. (Frankly, I fear people who actually believe in ‘devils’ much more than I do those who just laugh at the idea and play with it.)
To follow your beliefs, we’d have to get rid of all family ghost stories (almost every family has one); outlaw Dickens, Shakespeare, Stephen Vincent Benét, and lots of others with all of their ghosts, spirits, etc.
Our literary and folk history is full of ghostly and devilish stuff - and it’s there for good reasons. It shows us our fears and existential concerns; highlights our mortality, human weakness and continuing connection to ancestral and atavistic beliefs; and often portrays important concepts in assimilable ways. We play those out, at Hallowe’en.
Again, I’ll keep the ‘celebration’. It’s lots of fun for kids, and very thought-provoking for others.