I believe you have it backward. The bible is founded on the Church, not the other way round. The scriptures, as written and handed down (paradosis, or tradition), are based on the oral Apostolic teachings. The Church was founded without NT scripture, and grew for 20-30 years with absolutely no NT scripture. Zero. How did it do that? Look to the prologue of Luke (Luke 1:1-4): His prologue explains that Luke wrote the Gospel only to confirm the oral Apostolic teaching that Theolphilus had already received. Theophilus learned nothing new from scripture. He was provided only with written confirmation of the oral teaching he already had.
Everything in scripture came from within the oral tradition, otherwise the bible would not exist. Our Lord did not dictate the bible to scribes. Rather, He promised the Holy Spirit to remind the Apostles of all that He had taught them, and to teach them further (John 14:26). None of the NT was written while our Lord was speaking, or while those events were being played out, but rather, 20-30 years later. All that is in the Gospels was handed on by the oral teaching tradition (paradosis) of the Apostles. Even the Acts were written by Luke for the same purpose, but written as much as 32 years after they occurred. Since Luke was not an eyewitness, he relied solely on the Oral Apostolic Tradition.
Let’s be clear: the bible is also a tradition, which simply means that it was “handed down” to us. Notice that Luke begins with “it seemed good to me” (Luke 1:3) He does not claim to be inspired, so how do we know he was? The Church, by her God-given authority, has declared it so. The bible, as a written record, is incomplete and tells us so in many places (i.e. Luke 3:18, John 20:23, John 21:25, Acts 2:40, 1 Corinthians 11:34). Since man lives on every word that flows from the mouth of God (Deuteronomy 8:3, Matthew 4:4, Luke 4:4), and the bible tells us that “every word” is not in the bible, one can have only an incomplete teaching if they rely on the bible alone. Since God’s Word does not return to him void (Isaiah 55:11) “every word” must be kept somewhere else. The Church.