The authority of hell cannot prevail against Christ's churches, nor did the bible teachings die out and had to be given a second time.
Words mean things. Show me where I said they died out? I said they were lost for nearly 1000 years. Rome had a choke-hold on Christianity for that period of time. There were sporadic lights as in the Waldensians and John Huss, but not enough to break Rome's domination of Christendom. And because of the verses you quoted, the truth did not die out. When the Reformation occurred it loosened Rome's grip. Contrary to what you protest, there were many aspects of theology that the Reformers and Puritans improved upon in regards to scholarship. The Patristic Age was a time of mixture and error. Arianism was running rampant. Its kissing cousin, the Monophysite controversy, carried over to the 5th-century. The teachings of the apostles and prophets were diluted with emerging Roman paganism. The true faith was persecuted during this time, only to emerge as militant as ever in 1517.
I do not expect you to agree with my rendition, but I am going to put it on record for others to consider.