Christ Jesus having Come from God
Even if somebody acted like Christ Jesus, preaching the gospel, healing the sick, reviving the dead, and exercising other miracles, he cannot establish Christianity.
The key to the success and glory of Christ Jesus is His association with God. There might be somebody who looks clever, stronger, or more merciful than Christ Jesus, but if his linkage to God is weaker than Christ Jesus, he cannot succeed in establishing a religion like Christianity.
In this context, the Gospels must be books proving Christ Jesus' tie with God. The most important thing is that God sent Christ Jesus, which must be the main theme of the Gospels. So, the Gospels should be written in a way that readers can see God through words and deeds of Christ Jesus.
God is above all the mankind. God is god for every member of the mankind. God is indeed the god of Hebrews or Jewish people, but He is more than that. The Old Testament is volumes of books proving that God is the god of Hebrews or Jewish people; it does not tell that God is also the god of other tribes than Hebrews or Jewish people. The Old Testament never asserts that God is also the god of Hindus, Chinese, Japanese, etc.
The earliest Gospel Mark was not originally written with the intention to declare that God is the god of all the mankind, although later Gospels, Mathew, Luke, and John, tell that Christ Jesus told disciples to preach the words of God to the world.
So, the early Christianity needed to prove that Christ Jesus was from God, and then God is the god of all the mankind. However, to achieve this goal, Mark describes only some concrete episodes of Christ Jesus in addition to some teachings of Christ Jesus. Is such description enough to prove that Christ Jesus was sent by God to human beings? Doesn't it need hundreds or more volumes of books to make readers fully understand the theory of Christ Jesus having come from God?
Nonetheless, Christians, priests, scholars, professors, etc. have been reading and studying the Gospels for 2000 years while arguing various issues at various depths. So, it can be said that the Gospels are books that can at least withstand criticism, scrutiny, attacks or negligence.
Anyway, today for most of peoples in the world, Christianity is the Gospels themselves. The most precious product the mankind has ever produced is the Gospels that prove Christ Jesus having come from God.
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Mar 8:12 And he sighed deeply in his spirit, and saith, Why doth this generation seek after a sign? verily I say unto you, There shall no sign be given unto this generation.