The book of revelation was the last book added to the bible and it was not because the church was screaming for it actually the church was not very
happy with it, The authenticity of the book was in question for a long time by the already establish church.
The most formidable antagonist of the authority of the Apocalypse is Dionysius, Bishop of Alexandria, disciple of Origen. He is not opposed to the
supposition that Cerinthus is the writer of the Apocalypse. "For", he says, "this is the doctrine of Cerinthus, that there will be an earthly reign
of Christ, and as he was a lover of the body he dreamed that he would revel in the gratification of the sensual appetite". He himself did not adopt
the view that Cerinthus was the writer. He regarded the Apocalypse as the work of an inspired man but not of an Apostle (Eusebius, Hist. Eccl., VII,
25). During the fourth and fifth centuries the tendency to exclude the Apocalypse from the list of sacred books continued to increase in the
Syro-Palestinian churches. Eusebius expresses no definite opinion. He contents himself with the statement: "The Apocalypse is by some accepted among
the canonical books but by others rejected" (Hist. Eccl., III, 25).
More information here
The predictions in the old testament were written after the fact that is why they look like they were real, after all the bible was compiled after the
The same in the new testament the gospels were written after Jesus was death and so the apostles....... so actually it was nobody there to ask how
much of the gospels were true or not.
If is something you will never be able to do......... and that is to ask death people to tell you if what is written in their name was their true