From the very Viewpoint of Christ Jesus
According to theories, early Christian leaders such as Paul and Peter did not use the Gospels according to Mark, Luke, Mathew, and John, since these gospels were written about the time when Paul and Peter were executed in Rome in late 60s.
Then, how did they promulgate their faith in Christ Jesus? In today's churches, the Gospels are essential items. It is unthinkable to diffuse the teaching of God and Christ Jesus without the Gospels. But for hundred years or more after the death of Christ Jesus around A.D. 30, Christian leaders taught Christianity without authentic Gospels.
Indeed, it was not the Gospels that established Christianity but work by Paul, Peter, etc. who did not use the Gospels.
But, if the Vatican preserved the memory of the mission by Christ Jesus, they could preach what Christ Jesus said and did 2000 years ago even today without referring to the Gospels. The Vatican must be able to say that disciples of Christ Jesus really heard He say this and that and such reports have been preserved and relayed in their organization. But the Vatican also relies on the Gospels.
From the beginning, the greatest contributor to the New Testament, Paul, did not directly see or hear Christ Jesus while He was alive and was preaching the gospel. So, Paul's knowledge of Christ Jesus and His words must have been very much limited, since it is thought, in a theory, that Paul did not read the Gospels according to Mark, Luke, Mathew, and John.
Put simply, the founders of early Christianity such as Paul and Peter did not know the Gospels. And, the Vatican established by Paul, Peter, etc. does not possess direct reports, records, or traditions about words and acts of Christ Jesus that must have been more detailed than the Gospels.
Consequently, there were and are no authorities that assure correctness of the contents of the Gospels.
Christianity of the Vatican version and even Protestant version has no proof that their teaching is authentic from the very viewpoint of Christ Jesus.
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Luk 2:16 And they came with haste, and found Mary, and Joseph, and the babe lying in a manger.