Paul had no interest in the earthly life of Jesus and cared little for those that did. He spoke only of a spiritual Christ. Even in his own words, he claims to be sent directly by God to be an apostle. (1 Corinthians 1:1, Paul called to be an apostle of Jesus Christ through the will of God...) Thus Paul by his own claims, had a direct line to God, something the original apostles never had. (There is the Trinity)
By tradition, Mark brought the Gospel to Egypt while Peter brought the Gospel to Rome. But the connection back to Paul is clear. Mark and in particular Peter being one of the original twelve, directly disobeyed Jesus. But what did Jesus have to say? "These twelve Jesus sent forth, and commanded them, saying, Go not into the way of the Gentiles, and into any city of the Samaritans enter ye not..." (Matthew 10:5) This was missing from Luke and Mark, Paul's followers.
What does Paul say about preaching to Gentiles? "And I went up by revelation, and communicated unto them that gospel which I preach among the Gentiles..." (Galatians 2:2) So who did Paul get revelations from?
Jesus himself never mentioned Adam, the Garden, etc. All of this is based on Paul alone, and the entire concept of no death before the Fall of Adam is also Paul, "Nevertheless death reigned from Adam to Moses, even over them that had not sinned after the similitude of Adam's transgression, who is the figure of him that was to come." (Romans 5:14) "For as in Adam all die, even so in Christ shall all be made alive." (1 Corinthians 15:22)
Paul's claims we are all being punished for Adam's sin, even if we never sinned ourselves. This is so unjust from God who stands for justice. But what does God has to say? But if a man be just, and do that which is lawful and right... he shall surely live, saith the Lord GOD. If he beget a son that is a robber, a shedder of blood, and that doeth the like to any one of these things...he (the son) shall surely die; his blood shall be upon him..." (Ezekiel 18:5, etc.) As God explained in Ezekiel, only the sinner will be punished for their own sins and not the sins of others. Nor will others be punished for sins they did not commit.
Paul also misquotes the Torah in relation to Abraham, "For if Abraham were justified by works, he had whereof to glory; but not before God. For what saith the scripture? Abraham believed God, and was counted unto him for righteousness. Now when a man works, his wages are not credited to him as a gift, but as an obligation. However, to the man who does not work but trusts God who justifies the wicked, his faith is credited as righteousness." (Romans 4:2-5) The Paulist book Hebrews made a similar claim: "By faith Abraham, when he was tried, offered up Isaac: and he that had received the promises offered up his only begotten son..." (Hebrews 11:17)
But is that what God had to say? "[B]ecause thou [Abraham] hast done this thing, and hast not withheld thy son, thine only son: That in blessing I will bless thee, and in multiplying I will multiply thy seed as the stars of the heaven, and as the sand which is upon the sea shore; and thy seed shall possess the gate of his enemies; And in thy seed shall all the nations of the earth be blessed; because thou hast obeyed my voice." Genesis 22:16-18.
James agrees with God, "Thou believest that there is one God; thou doest well: the devils also believe, and tremble. But wilt thou know, O vain man, that faith without works is dead? Was not Abraham justified by works when he had offered Isaac his son upon the altar? Seest thou how faith wrought with his works, and by his works was made perfect?" (James 2:19-22)
In no manner had Abraham "offered up" his son Isaac. He was ordered by God to sacrifice Isaac (as a test) and because Abraham obeyed God's commands, he was blessed. Paul rewrote this vital passage to reflect his own theology, not that of God.
Also, the church in order to make it look like Jesus was the founder of Pauline Christianity, rearranged the order in which the New Testament books were written. (We should note there was no New Testament as such until Marcion in the 2nd century.)