You have been shown that people who have physically died, do indeed speak.
Can you prove they don’t?
Jesus said Abraham spoke.
Jesus said the rich man spoke.
The Bible says Moses spoke.
The Bible says Elijah spoke.
The Bible says that a great multitude of people who have come out of the great tribulation sing to God.
After these things I looked, and behold, a great multitude which no one could number, of all nations, tribes, peoples, and tongues, standing before the throne and before the Lamb, clothed with white robes, with palm branches in their hands, and crying out with a loud voice, saying, “Salvation belongs to our God who sits on the throne, and to the Lamb!” Revelation 7:9-10
It seems all you have is denial; denial of the truth.
JLB