It is not that easy actually many blur points.
What blur points? 
New testament consists of letters of Paul who is i think the real prophet of Christian religion.
Paul played an important and strong role of further discipleship. But he is not the core of Christianity. He merely was a tool like others were. He called himself a servant of Christ. He was a pharisee of pharisees, a real Jew, appointed apostle to gentiles - such a paradox - illogic thing to say.
The interesting thing is; Paul had never seen Jesus of Nazareth in his life, in fact at first he was a big enemy of Nazarenes who were the real followers of Jesus, but on his way to punish Nazarenes, something happened near Damascus and he declared himself as the follower of Jesus.
Lets first clear out one thing. Who are the Nazareans you are talking about? The Jews who followed Jesus were not only from Nazarea.
On his way to Damascus where he was heading to persecute believing Jews with his letters from the high Priest Annas. He was blinded by Jesus and was called to serve Him. For three days he didnt eat and drink until he received his sight back. From that time he earnestly started serving Christ and spreading the Good News about salvation (described in Acts).
But the Jesus he was telling, was different than the Nazarene people that they knew, so he had arguments with these people which is clear in his letters.
If you have good arguments for this, bring it on. If you are repeating after some people, then I think you shouldnt touch it. Paul was not in conflict with the gospel or with the message of Christ. He rebuked Peter for his hypocracy. and that is all. (again described in Acts)
The other interesting thing is; apostles and Jesus himself were talking the language of Aramaic like the Jews but the Gospels were written in Grek nearly 70 years after the Jesus´s dead.
They did speak Aramaic, but they too spoke Greek. At that time Greek was the international language like English today although it was the Roman Empire. This was the hellenised area. The majority of people could speak, read, write in Greek. It was also the language of business, arts and philosophy.
Furthermore there is no sign or evidence that these Gospels were written by for instance Mark, it does not say " I am apostle Mark/Matthew/Luke, and writing these"
The Gospels circulated among the first Christians as they were written from one church to another. They were sealed and titled as the gospels from those authors. I suppose they personally knew those apostles and did not need the confirmation as they received those gospels from the apostles themselves.
however in letters of Paul, Paul greets people declaring himself as a messenger who spreading the gospels from God.
In most letters Paul and other apostles wrote greetings, however, those were the short and specific letters to specific churches and persons.
So it can be said the new testament which are actually the biography of Jesus filtered by the thinking of Paul which is the basis of christianity and the faith only depends on the Jesus´s suffer on cross. The writings which oppoesed to these declared heretic by Church.
Wrong. The gospels are not the biography of Jesus, but the records of Jesus ministry, his messages and his deeds.
Its not only Paul but also other apostles who delivered such messages. Paul actually was the strict pharisee who was persecuting those converted Jews for spreading the messages about the salvation through the cross.
I didnt understand your very last sentence.
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