Originally, the Jewish people, with the Old Testament. The Christians are also associated with it, but they follow the New Testament
The new Testament is read by the christian believers.
At least 600+ years after the New Testament of the Bible was written.
Christianity
The New Testament of the Bible. Christianity is not a religion. It is a relationship, with God. Christianity started after the death burial and ressurrection of Jesus Christ. It is not really a development from Judaism.
Christians as a whole profess to believe in the New Testament which is the bible books of Matthew through Revelation.
religion
Christianity shares the Old Testament with Judaism, and the New Testament is specific to Christianity.
The Old Testament authors were Jewish and the New Testament authors Christian, although some of the New Testament authors (Paul, for example) came from a Jewis background.
The Old Testament and the New Testament.The Old Testament starts with Genesis and ends with Malachi.The New Testament starts with Matthew and ends with Revelation.
There is no exact equivalent to the New Testament, but Homer's Iliad and Odessey together were somewhat the Greek equivalent to the Bible.
Paul aka Saul wrote the most letters in the New Testament