What does the Bible say about Halloween? Nothing. But it does speak concerning witches, the occult, and paganism.
Exodus 22:18, You shall not let a witch live.
Deut. 18:10-12, "Let no one be found among you who sacrifices his son or daughter in the fire, who practices divination or sorcery, interprets omens, engages in witchcraft, 11 or casts spells, or who is a medium or spiritist or who consults the dead. 12 Anyone who does these things is detestable to the LORD..."
The Bible definitely speaks negatively about occultic practices, spirits, and witches and condemns not only the practice but also the people who are involved in it. As Christians, we are to have nothing to do with the occult. Tarot Cards, contacting the dead, séances, lucky charms, etc., are all unbiblical and can harm a Christian's fellowship with God and open the Christian to demonic oppression. Most Christians know this and avoid these activities. But, the question still remains. Since there are ancient pagan connections and present occultic connections, what is the Christian to do?