"Your father Abraham rejoiced to see My day, and he saw it and was glad" (John 8:56) Moses as well!
"So in Christ we who are many form one body, and each member belongs to all the others" (Romans 12:5)
God is the God of Abraham, of Isaac and of Jacob. He is he God of all who believe in Him, past, present, and future, ALL THE SAINTS. How can you possibly say they are dead? "He is not the God of the dead, but of the living; you are greatly mistaken." (Mark 12:27)
Their bodies are clearly dead!
We are expressly forbidden to contact the dead.