The authors of the four New Testament gospels had a simple goal: to promote belief in the Christ they worshipped. Scholar Charles Guignebert, in his 1935 classic work Jesus, wrote:
“It was not the essence of Jesus that interested the authors of our Gospels, it was the essence of Christ, as their faith pictured him. They are exclusively interested, not in reporting what they know, but in proving what they believe.”
In other words, they were not historians, but propagandists. In fact, intensive critical study of the gospels has demonstrated that these documents do not qualify as history. Their authors don’t identify their sources, but it’s even worse than that. Matthew and Luke copied major portions of Mark’s gospel without mentioning that’s what they’d done, i.e., they plagiarized—and changed Mark’s text to suit their own agendas.