Scripture forbids necromancy. Necromancy is a form of sorcery used to summon spirits from the underworld (Sheol) to ask them to reveal the future for the sorcerer’s benefit - usually for a fee. That is why it is forbidden for a Christian to go to a fortuneteller. These spirits are usually demons, or a soul in hell who is doing the will of demons. Souls in hell are at the complete bidding of the evil ones, they have lost their free will.
Prayer to the saints has nothing to do with necromancy.
The saints are not dead, I repeat, the saints are not dead!
see Mark 12:26-27. The saints in heaven are alive and we can talk to them and they can intercede for us because they are alive in Christ. see Rev 6: 9-11
“The saints are not dead, I repeat, the saints are not dead!”
I’m not arguing against that. I *am* arguing that necromancy is wrong, and that necromancy isn’t merely about revealing the future, but communicating with post-death humans.
King Saul spoke with the post-death Samuel, as recorded in 1 Samuel 28, and that was deemed wrong. King Saul wasn’t looking for anyone to “foretell the future”; he was simply wanting to communicate (i.e., “pray”) to Samuel, to get some counsel.
What was the post-death Samuel’s response: He rebuked King Saul.
So, there’s your example of a pre-death human communicating with a post-death human — it’s condemned in Scripture, and those who are prayed to are “disturbed” (see v. 15) by the communication.
Just don’t do it. Talking with God is sufficient. He is enough. The post-death “saints” don’t contribute anything to what God Himself is able to do. If you want someone to join you in prayer, communicate with a pre-death human.