>>However, the Church has beliefs in parallel with Scripture, for example, the Didache, that did not make it into final Scripture, that is still held to be true.<<
Do you realize how weak that sounds? “The Church has beliefs in parallel with Scripture”? No kidding? I’d get out of that pagan cult as fast as I could.
No kidding is right.
Lots of religions have beliefs that parallel Scripture. Having a belief that parallels Scripture is no great accomplishment. All it does is prove that sometimes other religions get something right.
Satan knows that he's not going to get his best mileage out of outright lies. That's why there's truth mixed in with everything he lies to us about.
It's far more effective to mix truth in with the lies than to lie outright. People can see the outright lies immediately. Sorting lies out from truth is often more difficult. And that's where Scripture comes in. It's the standard by which truth is measured.
We are commanded to test the spirits to see if they are from God, and the ONLY thing we have to hold up as truth and the standard by which to measure anything, is the Holy Spirit, God breathed word of the living God.
If you believe that Scripture begets the Church, that is one perspective. However, the Christian one is that the Church begets Scripture at the guidance of God.