No. That's false. You
have been given scriptural backing, and
you know that because you subsequently asked for a specific citation from the Shepherd of Hermas after being told by TheLiturgist that intercessory prayer is explicitly found in it, and that the Shepherd is scripture in the Ethiopian and Eritrean traditions. You were subsequently also given specific reference to Tobit, which is considered canonical in many more churches than the Orthodox churches in East Africa.
You
have scriptural backing; you just don't like what it says according to the people who have these books in their Bibles, and so have subsequently decided that this is insufficient or somehow doesn't mean what it has always meant to the Ethiopians, Eritreans, Roman Catholics, Eastern Orthodox, and Oriental Orthodox, and so have tried to pacify yourself by stating that we must be sharing what we are sharing here in an effort to 'convince ourselves' that our stances are Biblical and true. That's frankly really doing fellow Christians dirty. There's no way to turn that into a charitable view of how the thread has gone, or even an accurate one.
If you can follow the logic here (by simply acknowledging what has actually been presented already in the thread as coming from scripture according to the churches specified, because it does), that means that it is
YOUR OWN FAULT (not anyone else's) that others supposedly haven't met your oh-so-important and not at all self-serving and malleable 'standard'. Maybe if you didn't move the goalposts every time someone brought you what you had previously asked for, you wouldn't need to keep asking for more and more kinds of evidence from people who are less and less likely to want to give it to you. We're not blind to what's going on here, and what you would thereby likely make of patristic references from the likes of St. John Cassian (or, rather, Abba Issac via St. John Cassian), the Apostolic Constitutions, St. Gregory Nazianzen, and the many others who wrote and preached on intercession in the early life of the Church.
Yeah, go figure...I have no idea why that might be the case. Whatever it is, I'm sure it's everyone else's fault for not reaching your standard, up to including the saints from whom we have inherited our ancient anaphoras which are the
actual standard of Christian belief in every indisputably apostolic church (that is to say, those of the Romans, the Greeks, the Mesopotamians, the Indians, the Egyptians, the Armenians, etc., etc.).
That's it. Everyone can pack it up and go home now. Some random guy on the internet is unimpressed with our churches and their apostolic foundations and faith. Excuse me while I go replenish the Nile with my tears.
Or...
This is the hymn "Sub Tuum Praesidium" (variously translated as "Beneath Thy Protection/Compassion/Mercy"), which is the oldest extant hymn to St. Mary as
Theotokos. It first appears in the historical record in a papyri containing the text of a Coptic (Egyptian) Nativity liturgy, which has been dated to the mid-3rd century (c. 250 AD). This is significant because the most effective voice to challenge what had been established in calling St. Mary
Theotokos, the one-time patriarch of Constantinople Nestorius, was not even born until c. 386, and did not come into conflict with the rest of the bishops over this issue until the Council of Ephesus in 431 -- that is to say, almost two centuries after the earliest written evidence we have of this hymn.
Given how this hymn is still recited to this day in the Roman Catholic, Eastern Orthodox, and Oriental Orthodox churches alike, the idea that this is anything other than acceptable and Orthodox belief and prayer is not sustainable. It was so even before c. 250 AD, of course (as it would be ludicrous to posit a scenario in which these churches, which are culturally, linguistically, and geographically distinct from one another, nevertheless converged on this one hymn which they would all thereafter use to express these beliefs and reinforce these practices which they likewise managed to all invent in like manner), and is to this very day, and will be forever into the future, since of course St. Mary's relation to her Son and Savior does not change.
And so when you read the translation given of the words that are being chanted here, you should be able to recognize this as an authentic source for the very early date at which asking for the intercession of the all-holy Theotokos St. Mary was considered entirely normal and indeed normative. The only earlier hymn to St. Mary in particular that I am aware of would be the annunciation itself (which is worked into various hymns, depending on where you're looking), which is of course actually in the Bible.
So we do actually have definitive proof that the early Christians asked for the intercession of St. Mary in particular, and addressed her as
Theotokos long before this begin to be unwisely considered a point of controversy following the whispers into the ears of Nestorius centuries later.