I think what confuses a lot of Christians is they think the Disciples brought parchment and quills on their walk with Jesus and took notes.
The apostles were largely illiterate. If not completely so.
The gospels were written as much as 50 years, probably the minimum period of time, after Jesus death.
And Paul, who's letters comprise most of the new testament, did not witness Jesus' ministry. Being a Pharisee he was the only sure literate one calling himself an Apostle. Though the Christian Gnostics called him, The Imposter.
The point is, the NT was not compiled nor written by Jesus or his Disciples.
The “Strange” Ending of the Gospel of Mark and Why It Makes All the Difference
James Tabor presents a new look at the original text of the earliest Gospel