QED,
There are several themes you should pursue.
The primitive Christian movement was broadly split into two: with the Peter/James group at Jerusalem, and the Paul group at several other places. (Notice that Paul had to defend himself from the Jewish Christian sect, saying that he was indeed a Hebrew of the Hebrews.) The original movements were initially seen as a Jewish sect.
Read: "St Peter versus St Paul: A Tale of Two Missions", Michael Goulder (Professor of Biblical Studies, Birmingham, England).
Then recognise how the NT was assembled: it took until the 4th century that the dominant Christian sect through the Trinitarian Athanasius came to a decision, aided by the Roman Emperors.
Read:
"Jesus Wars: How Four Patriarchs, Three Queens, and Two Emperors Decided What Christians Would Believe for the Next 1,500 Years:, Philip Jenkins.
"AD 381: Heretics, Pagans and the Christian State", Charles Freeman
"A New History of Early Christianity", Charles Freeman
It should be apparent that this long process, which included violent disagreements between the various Christian sects, would bias the writings selected for inclusion as the NT scriptures. That is the reason the NT basically comprises Paul's writings. It is possible that the only Petrine source could be the book of James.
The process also resulted in serious mistakes, where writings were included that fraudulently claimed to have been written by Paul.
Read:
"Who wrote the New Testament? The Making of the Christian Myth", Burton Mack
"The Authentic Letter of Paul: A New Reading of Paul's Rhetoric and Meaning", Dewey (and others).
When you have come to grips with the origins of the NT, then turn your view to the Hebrew Scriptures. Look at the origins of the OG (=LXX) and the MT, and the probable reasons for the large differences between them (and also with the DSS).
Come back to me when you have gone through this so I can then point you to the recent books by Spong (such as "Liberating the Gospels") and by Ehrman (such as "Forged").
Then ask that if the Bible was the Word of God, why did he take a back seat and take no interest in preserving and protecting it. The Bible is a very human book, which means every writing has to be understood through the culture (idioms, understandings, politics, etc) of the community that created and who edited it.
Examine a Bible writing as you would any other piece of literature. Each writer (and editor) was interested in their own immediate community, and was addressing that community with the purpose of having it change its behaviour and attitude.
Enjoy the journey.
Doug