People go to great lengths in their objection to stuff that "technically" sounds like necromancy. Necromancy and mediumship are both condemned in the Bible, but what are they exactly? In our society, necromancy is magick preformed from either using the dead or energies that are released at the time of death; while mediums are like of prophets, but who speak on behalf of the dead rather than delivering messages from God.
To say that any contact with the dead is necromancy, is like saying that anybody who shows any sign of rebellion in their life is practicing witchcraft. Except of course, that the Bible actually tells us that rebellion is as the sin of witchcraft; but it doesn't say that any and all contact with the dead is necromancy!
Jesus spoke with dead people on the Mount of Transfiguration. Paul talked about the cloud of witnesses, cheering us on as we run the race set before us. There is a huge, giant, enormous difference between Saul seeking out a medium because God would not speak to him anymore and he wanted to talk with his mentor Samuel -- and somebody having a vision of heaven where they happened to talk to a "dead" person there!
In the case with Saul, the Bible clearly states: "And Samuel said..." Not, "And
the demon pretending to be Samuel said..." I can see no justification for writing our own pet theology into this story! This comes from those who believe all the saints are sleeping until the Resurrection, and therefore are not available for talking to. This is also why all spirits of the dead simply
must be demons... all because it is the only way this particular theology works. No mention though on why Moses and Elijah were awake and available for Jesus to talk to.
In Paul's time, many people made the connection that eating meat offered to idols was the same as participating in the worship of said idol. Paul seemed to think differently. But he also cautioned us to be sensitive to our own conscience, ans well as to our weaker brothers and sisters.
I also look at how some would say that warfare is murder. The Bible condemns murder, but many people were sent to war by God. Many were executed by the command of God. Does that make murder ok? No. But it does prove that jumping to conclusions is wrong!
So many Christians jump to the conclusion that all contact with those who have died is necromancy. But this is not what the Bible says. Jesus had contact with dead saints, and brought Peter James and John along to watch! In OT times, seeking out a medium or necromancer was equivalent to seeking a different god besides the Lord. This is why it was forbidden. And this is why it is still dangerous in our day, if we attempt to ask the spirits of those who have died for answers when we should be looking to God!