True Purposes of Creation of the Gospels
Let's check the beginnings of the Gospels, since they might tell true purposes of their creation.
Luk 1:1 Forasmuch as many have taken in hand to set forth in order a declaration of those things which are most surely believed among us,Luke must have been written to the Roman authority to defend Paul in the trial that must have been the most important issue for Paul and Luke in Rome. They had to explain what Paul's belief was.
Luk 1:2 Even as they delivered them unto us, which from the beginning were eyewitnesses, and ministers of the word;
Luk 1:3 It seemed good to me also, having had perfect understanding of all things from the very first, to write unto thee in order, most excellent Theophilus,
Luk 1:4 That thou mightest know the certainty of those things, wherein thou hast been instructed.
Mar 1:1 The beginning of the gospel of Jesus Christ, the Son of God;Mark must have been written also to the Roman authority and Judaists in Rome who might be able to help Paul in the trial. Probably as Mark knew that Luke was writing his Gospel targeting the Roman authority, he wrote his version rather succinctly, mainly targeting influential Judaists in Rome and friendly Romans.
Mar 1:2 As it is written in the prophets, Behold, I send my messenger before thy face, which shall prepare thy way before thee.
Mat 1:1 The book of the generation of Jesus Christ, the son of David, the son of Abraham.Mathew must have written after Nero executed Paul and Peter in the wake of a big fire in Rome, though Paul must have been freed from the trial due to the effect of the Gospels according to Luke and Mark. As so many Christians were executed by Nero while Judaists in Rome were not attacked, Mathew must have written the Gospel to prove that Christianity had a strong tie with Judaism and Judaists.
Mat 1:2 Abraham begat Isaac; and Isaac begat Jacob; and Jacob begat Judas and his brethren;
Joh 1:1 In the beginning was the Word, and the Word was with God, and the Word was God.John must have written his version of Gospel after the Jewish-Roman War and the fall of the temple in Jerusalem. Christianity did not need to be linked to Judaism anymore like in the case of Mathew. Rather, it might cause a problem for Christians in Rome and the Roman Empire to be regraded as a kind of Judaists. Therefore, John clearly depicted Jesus as the founder of a new religion, Christianity. John must have wanted the Roman authority to read his Gospel and have clear distinction between Christians and Judaists so that Christians would not face disadvantage due to any connection to Judaism.
Joh 1:2 The same was in the beginning with God.
Joh 1:3 All things were made by him; and without him was not any thing made that was made.
Joh 1:4 In him was life; and the life was the light of men.
Joh 1:5 And the light shineth in darkness; and the darkness comprehended it not.
So, these Gospels according to Luke, Mark, Mathew, and John were written for an imminent need each. They were all written to save Paul and other Christians in Rome and the Roman Empire from persecution by the Roman authority. So, depending on a circumstance, a Gospel stressed Christianity's relationship with Judaism or another Gospel clearly separated Christianity from Judaism.
If these Gospels had been written from the beginning as authentic holy books for Christians, like those in Judaism, they must have been advertised so among the very early Christians based on the authority of Peter and Paul. And, followers of Peter and Paul must have handed over these documents to the next generations unfailingly as the very holy books. But it took 100 years or more for these Gospels to be recognized as canonical documents by the church.
It also tells that the emphasis in preaching by Christian leaders in the era of Paul, etc. must not have been put on reading these Gospels. Their preaching must have been made in the manner with contents such as expressed in Paul's letters. The core of early Christian teaching must have been how to live with faith in God and not how much followers would know about the mission by Christ Jesus.
So, those Gospel writers, Luke, Mark, Mathew and John, did not intend to make their writings authentic holy books of Christianity. They simply wrote them to respond to a need on each occasion. That is why these Gospels lack some complete style and mode suitable for authentic holy books.
However, they clearly and strongly explain what Christ was and what He did to us as readers like Roman officials, influential Roman citizens or Judaists in Rome or the Roman Empire.
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Rev 2:20 Notwithstanding I have a few things against thee, because thou sufferest that woman Jezebel, which calleth herself a prophetess, to teach and to seduce my servants to commit fornication, and to eat things sacrificed unto idols.
Rev 2:21 And I gave her space to repent of her fornication; and she repented not.