Some people, including so-called theologians say they have studied the books of Paul in the New Testament closely and could tell different men did the original authorship of them. They usually add that they have a B.S., PhD, an MA, a B.S.A. and whatever other credentials they have. However, there is absolutely nothing to cross-reference from that same time-period with exception of archaeological findings that prove authorship of New Testament Epistles. Ancient History is not quite the same thing.

I no longer have the books, but I read numerous ones on "Archaeology of The New Testament" (when studying via Liberty University - accredited) and many proofs of Biblical authenticity and who wrote which described books, are as well-established as anything can be. Have you heard of the "Dead Sea Scrolls?". YES, there are books in which the Apostle authoring them, did not attribute their name to their writing (e.g. Book of Hebrews and Book of Acts) Hebrews is believed to be authored by Luke the physician or the Apostle Paul and Acts by Paul himself.

Paul attributes himself to these epistles: Romans, 1 Corinthians, 2 Corinthians, Galatians, Ephesians, Colossians, 1 Timothy and 2 Timothy, among others. Other books mention very key info that Paul authored them, such as those in which he mentions his evangelical partner Timothy at certain points of his ministry. This includes 1 Thessalonians, Romans, Philemon, and Philippians. This count is 12 and possibly includes the Book of Hebrews as well – or possibly authored by the apostle Luke. Paul refers to Timothy as a "co-worker and Paul's personal messenger" for revisiting or a visit to previously written-to churches.

The book of Hebrews quotes extensively from the Old Testament. Paul, as a Pharisee, would have been familiar with the Scripture in its original Hebrew language. In other letters, Paul either quotes the Masoretic Text (the original Hebrew) or paraphrases it. In these cases, he had a co-writer (a penman). This is how Biblical Scholars have determined Paul's authorship to these other epistles I've listed.

Regarding Biblical Archeology, they have found all but a very few locations cities, etc... that are described in the Holy Bible. They are right now excavating the City of David that sits below Jerusalem, recently discovered. Artifacts they've found mention the question as to - "Why Jerusalem is known as the City of David?" Answer: The first mention in the Old Testament of Jerusalem as the “City of David” is found in 2 Samuel 5:6-7: “David captured the fortress of Zion from the Jebusites—which became the City of David.”.

Denying the authentic history of The Holy Bible, makes a man foolish. Attributing the miraculous things that occurred throughout written Biblical history as realities, is a choice. I recommend to anyone in doubt regarding Christian authenticity – The Gospel, to read some of Lee Strobel's books on the authentication of various aspects of Christian History and experiences. His education includes: University of Missouri, Yale Law School, Yale University, and an honorary doctoral degree by Southern Evangelical Seminary.

Hear the audio I produced, at the following link, regarding guidance for Christians and those being drawn to Jesus Christ, by The Holy Spirit. It is free streaming and free in-general. - - -

Author's Bio: 

I am a graduate of Liberty University (1996) for completion of theological studies. Bible studies are one of my most-covered book-subjects. Belief-Wise, I am a "Bapticostal", simply meaning I have Baptist and Pentecostal beliefs. Most importantly though, I am a born again "Christian". I am however, careful to only address those subjects I believe God has given me correct revelation on. I was a Christian Youth Minister, beginning in the 1980s for approximately 20 years (between youth ministries I served in other church capacities as well). I was also a guest speaker to churches, who invited me to present important Bible teachings to their evangelical congregations, during those same years. I am a redeemed man, who has received salvation by acceptance of Jesus Christ as Lord and Savior. I believe in what he did for me in shedding his blood and dying for me on the cross and in his resurrection from the dead, giving me the promise of eternal life, purely by grace; not due to anything I have done, other than to accept it freely (it's for everyone who believes/accepts Jesus).