High Priest in Heaven

Jesus is the only mediator we need between this world and the world to come:

For there is only one God and one Mediator who can reconcile God and people. He is the man Christ Jesus. (1 Timothy 2:5, NLT)

That is why we have a great High Priest who has gone to heaven, Jesus the Son of God. Let us cling to him and never stop trusting him. (Hebrews 4:14, NLT)

Our God is a living God. Believers have no reason to seek the dead:

When someone tells you to consult mediums and spiritists, who whisper and mutter, should not a people inquire of their God? Why consult the dead on behalf of the living? Consult God’s instruction and the testimony of warning. If anyone does not speak according to this word, they have no light of dawn. (Isaiah 8:19-20, NIV)

Deceiving Spirits, Demonic Forces, Angels of Light, Counterfeits for the Truth

Some believers question whether psychic experiences of talking with the dead are real. The Bible backs up the reality of these events, but not the idea of talking with dead people. Rather, these experiences are associated with deceiving spirits, demons, angels of light, and counterfeits for the true Spirit of God:

The Spirit clearly says that in later times some will abandon the faith and follow deceiving spirits and things taught by demons. Such teachings come through hypocritical liars, whose consciences have been seared as with a hot iron. (1 Timothy 4:1-2, NIV)

What I am saying is that these sacrifices are offered to demons, not to God. And I don’t want any of you to be partners with demons. You cannot drink from the cup of the Lord and from the cup of demons, too. You cannot eat at the Lord’s Table and at the table of demons, too. (1 Corinthians 10:20-21, NLT)

These people are false apostles. They are deceitful workers who disguise themselves as apostles of Christ. But I am not surprised! Even Satan disguises himself as an angel of light. (2 Corinthians 11:13-14, NLT)