The second approach would be to ask what the sources are that we have about Jesus.
I take it as a given that Mark’s Gospel was written like a classical Greek tragedy, with the climax of the transfiguration on the mountain and the subsequent descent into death. The post-resurrection appearances reported in the last twelve verses of Mark are not found in the earliest manuscripts. In Mark, Jesus is said to be quoting the Greek Septuagint version of Isaiah to make his point. Unfortunately, the Hebrew version says something different than the Greek. In Isaiah 29:13, the Hebrew says, “Their fear of me is a commandment of men, which they have learned by heart,” while the Greek version - and Mark’s Gospel - says, “In vain they worship me, teaching as doctrine the commandments of men” [Revised Standard Version].
This was apparently considered inappropriate, and scholars suspect that the author of Luke’s Gospel consulted an additional source to enhance the message. The stories of the prodigal son and the Good Samaritan come from this source. Like Luke, Matthew is said to have drawn on other sources, but takes a different approach. His Gospel contains several parables, namely the parable of the tares among the wheat, the treasure, the pearl, the net, the unforgiving servant, the laborers in the vineyard, the two sons, and the ten virgins.
John’s Gospel is unique in its approach, not repeating the Gospel with additions, but taking a completely different angle. Bart Ehrman says that scholars have long suspected that John, although the last Gospel to be written, had an earlier written account of Jesus’ miracles, at least two accounts of Jesus’ long discourses, and possibly another passion source.
The Pauline epistles were written about 20 to 30 years after Jesus’ death, and Gary Habermas has said that within 150 years of Jesus’ death, there are over 42 sources that mention his existence and record many events of his life."
The Flavian source from 95 AD, that of Josephus, has been discredited because it was allegedly written with ulterior motives. The author, Josephus, was Jewish, and his reference to Jesus is atypical of Jewish sensibilities. In his work Antiquities 20 v.9 we read, “…and brought before them the brother of Jesus, who was called Christ, by name James, and some others; and when he had brought a charge against them for breaking the law, he delivered them up to be stoned.”
It is curious that James is mentioned as the brother of Jesus who is called “Christ,” considering the meaning of the word. In another place it says, “Now there was about this time Jesus, a wise man. For he was a doer of amazing deeds, a teacher of men who gladly accept the truth. And he gained a large following both among many Jews and among many Greeks. And when Pilate condemned him to the cross at the suggestion of the leading men among us, those who first loved him did not abandon him. And the tribe of Christians named after him has not died out to this day.”
Recognizing Jesus as a “wise man” who was “a teacher of those who gladly accept the truth” is a bit strange for someone who is first a Jew and second a member of the Roman court, where Christians were considered atheists because they denied the existence of the gods. But it is perhaps a more realistic description of how he was seen outside the Gospels.
The mention of Jesus in the Talmud, which occurred several hundred years after the event, is more in keeping with Jewish antipathy toward the man who was supposedly the Messiah whom the Jews did not recognize. In Sanhedrin 43a it states that: “Jesus the Nazarene practiced magic and deceived and led Israel astray.” It continues, “Jesus the Nazarene was hanged, and a herald went before him forty days proclaiming, ‘Jesus the Nazarene is going out to be stoned to death because he practiced magic and incited and deceived Israel into idolatry.’ Whoever knows anything in his defence, let him come and set it forth.” But finding nothing in his defence, they hanged him on the eve of the Passover."
Around 116 AD, Tacitus, in the Annals, Book 15, Chapter 44, refers to Jesus, Pontius Pilate, the execution of Jesus, and the existence of the first Christians in Rome: “Christ, the founder of the [Christian] name, was executed by Pontius Pilate, the procurator of Judea in the reign of Tiberius. But pernicious superstition, suppressed for a time, broke out again, not only in Judea, where the mischief originated, but also in the city of Rome.” The “superstition” was that Jesus had risen from the grave.
Another Roman writer from around 121 A.D. wrote about a certain Chrestus who was allegedly stirring up trouble among a group of Jews. According to historian James Dunn, “Suetonius misheard the name ‘Christ’ as ‘Chrestus’” and also misunderstood the account, assuming that the followers of someone named Chrestus were causing unrest within the Jewish community because of his instigation."
The philosopher Mara Serapion, a Syrian Stoic philosopher in the Roman province of Syria, is known only through a letter he wrote in Syriac to his son, whose name was Serapion and who lived about 70-140 A.D. (However, some scholars think the letter was written in the second century). He wrote the following: “What advantage did the Athenians gain from the murder of Socrates? Famine and plague came upon them as punishment for their crime. What advantage did the men of Samos derive from the burning of Pythagoras? In an instant their land was covered with sand. What advantage did the Jews derive from the execution of their wise king? Shortly afterward, their kingdom was abolished. God rightly avenged these three wise men: the Athenians starved to death, the Samians were flooded by the sea, and the Jews, despairing and driven out of their own kingdom, live in utter dispersion. But Socrates is not dead because of Plato, Pythagoras not because of the statue of Juno, and the wise king not because of the “new law” he established.”
There are also numerous Gnostic gospels, written between 100 and 400 A.D., in which Jesus is described as the bearer of a hidden knowledge, critical of the material world, that points a way to salvation. Many sources are extravagant, fanciful texts, including a scene with a laughing Jesus. These texts bear some resemblance to the proposed Q source but are very different. However, they can be used as evidence for the existence of Jesus. The Gospel of Thomas, much reported recently, is a collection of 114 sayings of Jesus without narrative, leading some to believe it was written early.
There is a letter by Clement of Rome (dating from about 95-97 AD) that is not included in the canonical collection. It alludes to Romans, Galatians, Ephesians, Philippians, and other New Testament literature. Clement is said to have been ordained by Peter. Ignatius of Antioch, considered a disciple of Paul and John, was martyred around 100 AD and wrote extensively on the historical Jesus in Trallians, Smyrneans 1 and Magnesians xi.
The character of these testimonies is largely proclamatory; they call people to faith in Jesus and proclaim him as the Saviour of the world. The titles of the Gospels “according to Matthew” etc. were added late in the second century. For example, Papias (c. 140 AD) knows all the Gospels but has heard only of Matthew and Mark; Justin Martyr (c. 150 AD) knows none of the four alleged authors.
The formation of the Christian canon was a slow development over several centuries. The idea of a “canon” of recognized and authoritative works predates Christianity and began with the development of the Greek schools of philosophy. At the beginning of the second century, Christianity had a problem with a multitude of texts, letters, and gospels, all claiming to be authentic works of the first generation of Christians. Judaism also had a similar abundance of religious texts, from which it selected some and considered them “Scripture” and, above all, the Word of God. It seems that Marcion’s “heresy” gave second-century Christianity the impetus to define which of these various texts had the status of “scripture” and which did not. Marcion held that the coming of Jesus had made the entire Jewish law and scriptures obsolete, and that the “God” of the Jews was in fact quite different from the God preached by Jesus and decided that there were in fact two gods.
It was Irenaeus who first defended the four canonical Gospels-Matthew, Mark, Luke, and John as the oldest and only biblical Gospels, and he did so at least in part on the grounds that these four had always been considered the oldest and most authoritative. Not long after, we get the first reference to a defined list of texts considered biblical. In the sixteenth century, a manuscript called the Muratorian Canon, dating from the late second century AD, was discovered in a library in Milan. However, until the Council of Trent in 1546, there was no definitive statement by the Catholic Church on the composition of the New Testament.