There is a Latin saying , with a grain of salt. That's how we should take ancient evidence. One can be certain in his beliefs, but one cannot sue his beliefs as proof of their veracity. And neither can we use the surviving documents. That's why the Church in her blessed wisdom calls it a faith, trust, hope, and not 'knowledge'.
As the eulogist said at Patriarch Alexi's funeral liturgy "We hope God will accept his soul." In other words, only God knows; we can only hope. Arrogance has no place in the catholic faith.
That's where you've got it all wrong.
You see, the Apostles wrote the New Testament and decided what should go in and in what order. They then translated this into 17th century English and hid it away for 16 centuries. The great scholar King James I read over this and was delighted. He proclaimed it free from error and millions of The Reformed® emerged from their hiding places (they had been practicing "real" Christianity all along) and began to practice YOPIOS.