Come on Kos, you are reaching now.
"God hath not cast away his people which he foreknew. Wot ye not what the scripture saith of Elias? how he maketh intercession to God..." (Rom 11:2) Paul's quote is an exact quote from the O.T. and is in the "historical present", a past action completed.
"I exhort therefore, that, first of all, supplications, prayers, intercessions, and giving of thanks, be made for all men;"(1 Tim 2:1) was written to Timothy and the church at Ephesus for them to pray and intercede and is a command for us today.
The Psalmist said, Psa 115:17 The dead praise not the LORD, neither any that go down into silence. But we will bless the LORD from this time forth and for evermore. Praise the LORD.
"But if they be prophets, and if the word of the LORD be with them, let them now make intercession to the LORD of hosts, that the vessels which are left in the house of the LORD, and in the house of the king of Judah, and at Jerusalem, go not to Babylon." (Jeremiah 27:18) Jeremiah was speaking of living, breathing men who were claiming to be prohets, not dead men.
"Then the angel of the LORD answered and said, O LORD of hosts, how long wilt thou not have mercy on Jerusalem and on the cities of Judah, against which thou hast had indignation these threescore and ten years? (Zach 1:12)
Zachariah was experiencing a visitation much like John on Patmos. The angel was inquiring not petitioning or interceding in order to give Zach an answer. Much like the angel did for John.
Paul said, and I repeat it for the umpteenth time,
1Ti 2:5 For [there is] one God, and one mediator between God and men, the man Christ Jesus; Who gave himself a ransom for all, to be testified in due time. Whereunto I am ordained a preacher, and an apostle, (I speak the truth in Christ, [and] lie not;) a teacher of the Gentiles in faith and verity. I will therefore that men pray every where, lifting up holy hands, without wrath and doubting.
So Kos, our job is to, "Rejoice evermore", and (1Th 5:17) "Pray without ceasing", for "the effectual fervent prayer of a righteous man (and woman too) availeth much."
Wat's your point? That we can't pray for someone? Is not praying for someone an intercession on behalf of someone? Is someone asking us to pray for them not a supplication for our intercession?
I don't know about the Protestants, but the Apostolic Church has believed and believes that Christ gave us life, He unshackled us from death, that those who are in heaven are alive and that they fervently and unceasingly pray for our souls.
Where is the wrong in asking the living on earth on in heaven to pray for us?