I don't believe the candy is "cursed but,
Matthew 18:18
18"I tell you the truth, whatever you bind on earth will be bound in heaven, and whatever you loose on earth will be loosed in heaven
I don't "celebrate" Halloween.
Sounds like it’s best that you stay home, then. But for God’s sake, DON'T OPEN THE DOOR!!! They only LOOK like the kids in your neighborhood!