The New Testament is the part of the Bible dealing with the time after Jesus was born and only Christians accept the New Testament. It deals with how Christians think Jesus did and what he taught. It also deals with how Christians reacted to his teachings, interpreted them and developed them.
The books of the New Testament
The New Testament starts with the four Gospels and continues with the Acts of the Apostles, these five sections were all written at least 40 years after the events described supposedly happened, they are mutually contradictory and unreliable.  After that come a variety of Epistles or letters attributed to the apostle Paul but textual analysis suggests that many of these epistles had different authors. The epistles were probably written before the Gospels.
The New Testament was originally written in Greek though the people involved, Jesus, the disciples/apostles and others would have spoken Aramaic. It appears that during the long period between when the assumed events happened and the time the stories were written down the narrative even passed from Aramaic speakers to Greek speakers. Were these gentile, Greek speakers likely to be eye witnesses to events in Israel?
The New Testament includes any number of supposed miraculous events and actions by Jesus and his Christian followers. This is typical of what is found in different mythologies and if a new religion labelled a cult came up with miracle stories like that frankly people would say it strains credulity.
Parts of the New Testament that are unrealistically hard to follow or clearly unreasonable are overlooked. Christians generally don't hate their own families or leave their families in the lurch to follow Jesus, Christians in the main don't sell all their possessions and give to the poor, Christians in the main keep enough possessions to ensure their financial security. The New Testament tells Christians to do all the above,  though other parts of the New Testament give a contradictory message.
- The Skeptic's Annotated Bible This is a good resource for refuting King James Bible
- What would Jesus do? From the Evil Bible website
- The Atheist's Bible Companion to the New Testament
- Bible Quizzes