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“What does the Bible say about necromancy?”

“Answer: Necromancy is defined as the conjuring of the spirits of the dead for purposes of magically revealing the future or influencing the course of events. In the Bible, necromancy is also called “divination,” “sorcery” and “spiritism” and is forbidden many times in Scripture (Leviticus 19:26; Deuteronomy 18:10; Galatians 5:19-20; Acts 19:19) as an abomination to God. It is something that the Lord speaks very strongly against and is to be avoided as much as any evil. The reason for this is twofold.

First, necromancy is going to involve demons and opens the one who practices it to demonic attack. Satan and his demons seek to destroy us, not to impart to us truth or wisdom. We are told that our “enemy the devil prowls around like a roaring lion looking for someone to devour” (1 Peter 5:8). Second, necromancy does not rely on the Lord for information, the Lord who promises to freely give wisdom to all who ask for it (James 1:5). This is especially telling because the Lord always wants to lead us to truth and life, but demons always want to lead us to lies and serious damage.

The idea that dead people’s spirits can be contacted for information is false. Those who attempt such contact inevitably contact demonic spirits, not the spirits of dead loved ones. Those who die go immediately to heaven or hell—heaven if they believed in Jesus as Savior, and hell if they did not. There is no contact between the dead and the living. Therefore, seeking the dead is unnecessary and very dangerous.”

https://www.gotquestions.org/Bible-necromancy.html

While I agree with most of your reply here; I cannot agree with this:

Those who die go immediately to heaven or hell—heaven if they believed in Jesus as Savior, and hell if they did not.

What about the Great White Throne judgement to come?

Revelation 20:11-15

"Then I saw a great White Throne and him who was seated on it. Earth and sky fled from his presence, and there was no place for them.

And I saw the dead, great and small, standing before the throne, and THE BOOKS WERE OPENED.

Another book was opened WHICH IS THE BOOK OF LIFE.

The dead were judged according to their works as recorded in the books.

The sea gave up the dead that were in it, and death and Hades gave up the dead that were in them, and each person was judged according to their works.

Then death and Hades were thrown into the Lake of Fire. The Lake of Fire is the second death.

If anyone's name was not found written IN THE BOOK OF LIFE, he was thrown into the lake of fire."