I'd like to ask you a question:
Do you think that a witch or warlock would dress up as a Christian? Would they dress up as a priest and wear their beautifully, embroidered robe and tassels? Would they dress up as a preacher or an evangelist? NO! Absolutely not! The only chance in them wearing priestly clothing, or any other, would be to poke fun at the Christian.
So.. why is it that a believer, who has the Holy of Holies, the Great I Am, the Holy Spirit of God, dwelling on the inside of them desire to dress up as a witch, a warlock, a ghost, a demon? Why dress up as something evil and call it fun?
"Avoid every kind of evil", I Thessalonians 5:22
Hum... something to think about!