We understand your concern and share your desire to discern the truth in these matters according to Scripture. The phenomenon you describe is indeed troubling, especially when it involves those who do not know the Lord. The Bible is clear that there is no communication with the dead, and any appearance of such is not from God.
Scripture warns us in Deuteronomy 18:10-12 (WEB), "There shall not be found with you anyone who makes his son or his daughter to pass through the fire, one who uses divination, one who practices sorcery, or an enchanter, or a sorcerer, or a charmer, or a consulter with a familiar spirit, or a wizard, or a necromancer. For whoever does these things is an abomination to Yahweh." This passage explicitly condemns any attempt to communicate with the dead, which is what séances and similar practices seek to do. The fact that these experiences are happening to those who are unsaved should raise red flags, as they are not protected by the blood of Jesus and are vulnerable to deception.
In 2 Corinthians 11:14-15 (WEB), we are warned, "And no wonder, for even Satan masquerades as an angel of light. It is no great thing therefore if his servants also masquerade as servants of righteousness, whose end will be according to their works." Demons are deceivers, and they can impersonate others to lead people away from the truth. The experiences you describe could very well be demonic impersonations, especially since they involve those who do not have a relationship with Jesus Christ. The enemy seeks to distort the truth and lead people astray, even in their final moments.
We must also consider that these experiences could be the result of the mind and body shutting down, where the brain may create visions or hallucinations as it processes the transition from life to death. However, the fact that these visions often involve deceased relatives, especially unsaved ones, suggests a spiritual dimension that aligns more with deception than with natural phenomena. The hospice nurse’s dismissal of delirium or medication effects does not rule out spiritual deception, as she may not be considering the biblical warnings about such things.
Let us pray together for wisdom and discernment in these matters:
Heavenly Father, we come before You in the name of Jesus Christ, seeking Your truth and wisdom. Lord, we ask that You would open our eyes to the deceptions of the enemy and help us to stand firm in Your Word. We pray for those who are unsaved and facing death, that they would turn to You and be saved before it is too late. Protect them from the lies of the enemy, and let them see the truth of Your love and salvation. Give us discernment to recognize deception and the courage to speak Your truth in love. We pray that all who are lost would come to know Jesus Christ as their Lord and Savior, so they may be spared from eternal separation from You. In Jesus' name, we pray. Amen.
We encourage you to hold fast to the truth of God’s Word. The Bible is our ultimate authority, and it clearly states that the dead do not communicate with the living. In Luke 16:19-31 (WEB), Jesus tells the story of the rich man and Lazarus, where the rich man, in torment, begs Abraham to send Lazarus to warn his brothers. Abraham replies, "If they don’t listen to Moses and the prophets, neither will they be persuaded if one rises from the dead." This passage shows that even if someone were to return from the dead, it would not lead to true repentance or faith. The enemy seeks to mimic such things to deceive and lead people away from the truth.
If you or others encounter these situations, we urge you to speak the truth in love. Share the gospel with those who are unsaved, and pray for their salvation. The only hope for eternal life is through faith in Jesus Christ. In John 14:6 (WEB), Jesus says, "I am the way, the truth, and the life. No one comes to the Father, except through me." There is no other name by which we can be saved (Acts 4:12). Let us hold fast to this truth and share it with others, so they may be saved from deception and eternal separation from God.