here is a well sourced blurb...
The Bible is the holy scripture of the Christian religion, purporting to tell the history of the Earth from its earliest creation to the spread of Christianity in the first century A.D. Both the Old Testament and the New Testament have undergone changes over the centuries, including the the publication of the King James Bible in 1611 and the addition of several books that were discovered later.
Old Testament
The Old Testament is the first section of the Bible, covering the creation of Earth through Noah and the flood, Moses and more, finishing with the Jews being expelled to
Babylon.
The Bible’s Old Testament is very similar to the Hebrew Bible, which has origins in the ancient religion of
Judaism. The exact beginnings of the Jewish religion are unknown, but the first known mention of
Israel is an Egyptian inscription from the 13th century B.C.
The earliest known mention of the Jewish god Yahweh is in an inscription relating to the King of Moab in the 9th century B.C. It is speculated that Yahweh was possibly adapted from the mountain god Yhw in ancient Seir or Edom.
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Hezekiah
It was during the reign of Hezekiah of Judah in the 8th century B.C. that historians believe what would become the Old Testament began to take form, the result of royal scribes recording royal history and heroic legends.
During the reign of Josiah in the 6th century B.C., the books of Deuteronomy and Judges were compiled and added. The final form of the Hebrew Bible developed over the next 200 years when Judah was swallowed up by the expanding
Persian Empire.
Septuagint
Following conquest by
Alexander the Great, the Hebrew Bible was translated into Greek in the 3rd century B.C.
Known as the Septuagint, this Greek translation was initiated at the request of King Ptolemy of Egypt to be included in the library of Alexandria. The Septuagint was the version of the Bible used by early Christians in Rome.
The Book of Daniel was written during this period and included in the Septuagint at the last moment, though the text itself claims to have been written sometime around 586 B.C.
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New Testament
The New Testament tells the story of the life of Jesus and the early days of
Christianity, most notably Paul’s efforts to spread Jesus’ teaching. It collects 27 books, all originally written in Greek.
The sections of the New Testament concerning Jesus are called the Gospels and were written about 40 years after the earliest written Christian materials, the letters of Paul, known as the Epistles.
Paul’s letters were distributed by churches sometime around 50 A.D., possibly just before Paul’s death. Scribes copied the letters and kept them in circulation. As circulation continued, the letters were collected into books.
Some in the church, inspired by Paul, began to write and circulate their own letters, and so historians believe that some books of the New Testament attributed to Paul were in fact written by disciples and imitators.
As Paul’s words were circulated, an oral tradition began in churches telling stories about Jesus, including teachings and accounts of post-resurrection appearances. Sections of the New Testament attributed to Paul talk about Jesus with a firsthand feeling, but Paul never knew Jesus except in visions he had, and the Gospels were not yet written at the time of Paul’s letters.
The Gospels
The oral traditions within the church formed the substance of the Gospels, the earliest book of which is Mark, written around 70 A.D., 40 years after the death of Jesus.
It is theorized there may have been an original document of sayings by Jesus known as the Q source, which was adapted into the narratives of the Gospels. All four Gospels were published anonymously, but historians believe that the books were given the name of Jesus’ disciples to provide direct links to Jesus to lend them greater authority.
Matthew and Luke were next in the chronology. Both used Mark as a reference, but Matthew is considered to have another separate source, known as the M source, as it contains some different material from Mark. Both books also stress the proof of Jesus’ divinity more than Mark did.
The Book of John, written around 100 A.D., was the final of the four and has a reputation for hostility to Jesus’ Jewish contemporaries.
All four books cover the life of Jesus with many similarities, but sometimes contradictions in their portrayals. Each is considered to have its own political and religious agenda linked to authorship.
For instance, the books of Matthew and Luke present different accounts of Jesus’ birth, and all contradict each other about the resurrection.
And what about Thomas?