That is not Scriptural. The saints in heaven are NOT dead. They are in the complete fulness of life in God, to which we aspire on earth.
But in the account of the bush, even Moses showed that the dead rise, for he calls the Lord 'the God of Abraham, and the God of Isaac, and the God of Jacob.' He is not the God of the dead, but of the living, for to him all are alive."
Luke 20:37-38
Then at the Transfiguration, Christ appears with Moses and Elijah - living, not dead.
How do you know they went to heaven in the first place? After all, only God knows the heart of a person, we do not. The most pious appearing are not necessarily saints.
You are trying to apply that verse to make spiritism ok. That’s not what the verse is about.