So, the assumptions here are that the dead are conscious, by some means able to hear your prayer, and also by some means able to intercede.
This almost sounds as if you believe in the heresy of "soul sleep". I hope that is not the case... It is certainly not a Lutheran position. The Apology of the Augsburg Confession admits that the "
concerning the saints we concede that, just as, when alive, they pray for the Church universal in general" To do that, they must be conscious. In that, we agree with the Lutheran Church. We just disagree that it ends there. I will give you a few reasons, from Holy Scripture, as to why we believe what we do.
Note that I post these knowing full well that the Lutherans do not interpret the Scriptures in the same way that the Orthodox do... I was a Confessional Lutheran myself for years. If you are here to learn what and why we believe what we do, I will be happy to continue to dialog, but I will not respond to any debate or argument.
In that regard, I have 4 questions:
1) Does the state of the dead give them abilities beyond those we have here on earth? I imagine there are thousands (if not millions or billions) of people asking for the intercession of Mary at any given time. Is she able to respond to all these requests?
2) Do the dead only intercede by praying to God for you, or do they intercede in other ways?
3) Are the prayers of the dead more effective than those of the living?
4) What scripture, tradition, or church father are these beliefs based upon?
To add to Rus' excellent answer:
In John 11:25, Jesus tells Martha "
I am the resurrection and the life. He who believes in Me, though he may die, he shall live."
Jesus tells us in Mark's Gospel (verse 27), that "
He is not the God of the dead, but of the living."
Also, Paul, in his letter to the Romans (ch 8, vss 38-39) tells us, "
For I am persuaded that neither death nor life, nor angels nor principalities nor powers, nor things present nor things to come, nor height nor depth, nor any other created thing, shall be able to separate us from the love of God which is in Christ Jesus our Lord."
Those who have died on Earth, are truly alive in Christ. An "earthly" death cannot separate us from God or from one another. We are one Body, one Church, in Christ.
Paul also tells us, in his first letter to Timothy chapter 2, verse 1, "
Therefore I exhort first of all that supplications, prayers, intercessions, and giving of thanks be made for all men, for kings and all who are in authority, that we may lead a quiet and peaceable life in all godliness and reverence. For this is good and acceptable in the sight of God our Savior,"
It pleases God that all believers pray for one another.
Saint John tells us in his Apocalypse (Chapter 5, verse 8): "
Now when He had taken the scroll, the four living creatures and the twenty-four elders fell down before the Lamb, each having a harp, and golden bowls full of incense, which are the prayers of the saints."
Here, we see our prayers being offered to God by the Elders (with white robes and gold crowns - To see the robes in context, see: Revelation 6:11, Revelation 7:9, Revelation 7:13-14. To put the crowns in context, see: 1 Corinthians 9:25, 2 Timothy 4:8, James 1:12, 1 Peter 5:4, Revelation 3:11, and Revelation 2:10). These Elders symbolize the Church Triumphant.
Again, Saint John describes in Apocalypse 8:3-4 "
Then another angel, having a golden censer, came and stood at the altar. He was given much incense, that he should offer it with the prayers of all the saints upon the golden altar which was before the throne. And the smoke of the incense, with the prayers of the saints, ascended before God from the angels hand."
We also read of the Archangel Raphael telling Tobit that
he personally gave his prayers to God: "
When thou didst pray with tears, and didst bury the dead, and didst leave thy dinner, and hide the dead by day in thy house, and bury them by night, I offered thy prayer to the Lord."
So we see that the Angels also offer our prayer to God. And yes, I understand that you do not see Tobit as canon, which is why I did not offer it alone.
Knowing also that any in God's presence must be righteous, Saint James tells us that "
The effective, fervent prayer of a righteous man avails much." (5:16)
So yes, the prayers of the LIVING Saints Triumphant (whom you have called dead, do have a effect greater than those of us who are yet to be made fully righteous.
I hope this helps you understand our position a bit more.