No the early church used the OT as it pointed to Christ as the fulfillment of the scriptures.. so there were scriptures and THOSE scriptures were being used daily in the church ... also scripture was being written as the admonitions and encouragements to the new church
2 Peter 3:15-16 - Meanwhile, consider that God's patience is meant to be man's salvation, as our dear brother Paul pointed out in his letter to you, written out of the wisdom God gave him. In that letter, as indeed in all his letters, he referred to these matters. There are, of course, some things in his letters which are difficult to understand (... it may help readers to know that even early Christian leaders had problems following some of Paul's teaching), and which unhappily, ill-informed and unbalanced people distort as they do other scriptures, and bring disaster on their own heads.
And according to the premise behind it, being the instrument of Divine revelation equates to having assured infallibility, via formal decent, and thus submission to the natural branches would be mandated.
But as it does not, and God established most of Scripture and preserved Truth without an assuredly infallible magisterium, thus Christianity required dissent from those who presumed that formal decent assured perpetual and supreme doctrinal authority. And thus the authority of John the Baptist and the Lord Himself was a problem for them. And as God can raise up from stones children to Abraham, so He can do today by faith in the gospel of grace, to continue to build His church of the regenerate.
I could apply that same verse to you. What makes you qualified to interpret the Bible?
Maybe you are your own God, perhaps?