many Greek books with various authors capture the stories about Jesus.
There is Gospel of Peter (rejected).
There is Book of 1 Peter (accepted),
There is Book of 2 Peter (accepted) - these 2 books are among 27 other Greek books declared as cannon
However the oldest torn manuscripts of 1 Peter/ 2 Peter dated around 3rd century. Since none of the books have a concept of having chain of narrators or chain of scribes showing its history linking to Peter.
In order to declare the story being true, they must believe in an event where Holy spirit has guided them in selecting 27 true Books.