Christian scholars admit that they do not know. They admit that, if the four gospels were written by-Matthew, Mark, Luke and John, they must have been written in Hebrew. And yet a Hebrew manuscript of any one of these gospels has never been found. All have been and are in Greek. So, educated theologians admit that the Epistles, James and Jude, were written by persons who had never seen one of the four gospels. In these Epistles—in James and Jude—no reference is made to any of the gospels, nor to any miracle recorded in them.
The first mention that has been found of one of our gospels was made about one hundred and eighty years after the birth of Christ, and the four gospels were first named and quoted from at the beginning of the Third Century, about one hundred and seventy years after the death of Christ.
We now know that there were many other gospels besides our four, some of which have been lost. There were the gospels of Paul, of the Egyptians, of the Hebrews, of Perfection, of Judas, of Thaddeus, of the Infancy, of Thomas, of Mary, of Andrew, of Nicodemus, of Marcion and several others.
So there were the Acts of Pilate, of Andrew, of Mary, of Paul and Thecla and of many others. Another book called the Shepherd of Hermes.
At first not one of all the books was considered as inspired. The Old Testament was regarded as divine; but the books that now constitute the New Testament were regarded as human productions. We now know that we do not know who wrote the four gospels.
The question is, Were the authors of these four gospels inspired?
If they were inspired, then the four gospels must be true. If they are true, they must agree.
The four gospels do not agree.
Matthew, Mark and Luke knew nothing of the Atonement, nothing of salvation by faith. They knew only the gospel of good deeds—of charity. They teach that if we forgive others God will forgive us.
With this the gospel of John does not agree.