Setst RE: I will not be able to go into detail with all of your questions, but what I will summarize here could legitimately be used to understand the most likely answers to the rest of your questions.
I do not doubt that there are those in the Church who would of felt like there was a bit of a vacuum after all the Apostles died. I am sure I would have felt the same way, despite all the great Early Church Fathers and Defenders of the Faith that came afterward.
After the Apostles were gone, the Early Church Fathers within Christianity were more concerned with belief in Jesus and the core doctrines of the Christian faith called “
the rule of faith,” and the worship of the one God, all of which were founded on the teaching of the original Apostles – especially the
Four Gospels,
Acts of the Apostles, and many of
Paul’s Epistles to the Churches, which were all available with manuscripts being copied distributed at an ever increasing rate.
The Rule of Faith affirms divine action in history – what God has done, and what God will do through the person of Jesus Christ and the Holy Spirit as was first faithfully recorded in the Old Testament Scriptures and the New Testament Apostolic Writings. Therefore, the Rule of Faith is a chronological description of the central Bible story line from OT to NT (creation, the fall, redemption, consummation of all things/2nd coming of Christ.
Rules of Faith vs Personal Saving Faith
The Rule of Faith did not really deal with defining the personal faith that saves as taught by Lord Jesus and the Apostles, although many examples of that true personal faith are extant within historic documents – especially all those early Christians who were willing to remain poor, and persecuted, suffering and dying for their faith rather than recant their Faith in Jesus.
Nevertheless, this lack of defining personal faith within the early Church later led to the heresy regarding the Faith within the Church.
Later on within the 2nd Century, Books of Scripture most familiar to the Church that were formed into a more complex Canon, but that Canon was not exhaustive, because not all of the Apostolic Letters to the Churches were widely copied and distributed at that early date.
Except for the Four Gospels, Acts and Paul’s letters which were at times included together, the
Muratorian Canon is believed to be the first Canon to include other Epistles that were circulated and read within 2nd century orthodox Christianity…
Muratorian canon (C. 170 AD perhaps in response to Marcion's "Apostilikon"):
- The Four Gospels,
- Acts,
- 13 Paul's epistles,
- Jude,
- 2 John,
- Apocalypse of John (Revelation)
- Apocalypse of Peter
- Wisdom of Solomon.
Basic Elements of the Rule of Faith for the 2nd Century
When we consider these examples of the Rule of Faith in the 2nd century, and the Early Apostolic Letters that clearly were the authentic historically, we can discern a summary of elements of that Rule of which the early Church was dedicated to, and has its origins in, the 1st century Apostolic writings contained in our the New Testament today:
- There is one God, the creator of heaven and earth.
- This same God spoke through the prophets of the OT regarding the coming Messiah.
- Jesus is the Son of God, the Word of God made flesh, born from the seed of David in Bethlehem, through the virgin Mary
- All things were created through Jesus, who came into the world, God in the flesh.
- Jesus came to bring salvation and redemption for those who believe in him.
- Jesus physically suffered and was crucified under Pontius Pilot, raised bodily from the dead, and exalted to the right hand of God the Father.
- Jesus will return again to judge the world.
We find nothing in the 2nd century rule of faith summaries that diverge from the NT writings.
The Apostle's Creed
Besides the Four Gospels, Acts, Paul’s Epistles and the Muratorian Canon, and lists of the Rule of Faith by the Early Church Fathers, it may be that the Apostles Creed, at least in an early form, was first published in the 2nd century.
2nd Century Diversity within Christianity
2nd century Christian doctrine was diverse in various non-core beliefs and traditions, but core doctrines were firmly defended as the rule of faith throughout Christianity against what were clearly heretical groups that popped up in the 1st and 2nd centuries when compared to those core beliefs.
In particular, the four Gospels, Acts, and the letters of Paul were unanimously and universally foundational for the 1st and 2nd century church in setting the rule of faith. Early leadership, literature, NT manuscripts, and rhetoric all favor a predominantly orthodox Christianity against heretical offshoots within the known world. Every new offshoot calling itself “Christian” was judged as being heretical or orthodox based on that well established Rule of Faith.
Champions of the Faith – Those who upheld the Rule of Faith
As eluded to earlier, within the Church, shortly after the Apostles, existed true champions of the Apostolic Faith. These Church Fathers include recognized authorities within the church, true successors of the Apostles. These were the early apologists and polemists.
Among these early Church fathers of the late 1st to 2nd centuries include: Dionysius of Corinth, Hippolytus, Irenaeus, Clement of Alexandria, Tertullian, Justin Martyr, Origin, and of course the
4 Gospels, Acts, and the
letters of Paul to the Churches as the foundation. All these witnesses to the true faith were clearly recognized as representing the true authorities within the early Orthodox Church in defending the non-negotiable essentials, The Rule of Faith, against heresies for the 2nd century church. Almost every Christian apologist was also a bishop.
In particular, these leaders were instrumental in defending the faith against the following 2nd century heresies that sprouted up in the 2nd century, although some, such as the Gnostics, have their origins in the first century, of which the Apostle John warned about in his epistles:
- Ebionites
- Marcionites
- Gnosticism, which includes teaches of Cerinthus, Basilides, Valentinus, Ptolemy, Heracleon, and Theodotus
Therefore the early Church definitely was unified as to essential doctrines of the faith even though these Churches existed in many locations.
Orthodox vs Heresy: Easy to Distinguish
Archaeology has found that Orthodox Christian documents outnumber Gnostic or heretical documents by about 6 to 1.
Not only that, but the orthodox Christian apologists only site the orthodox texts as contained in the Apostolic Writings and their companions. No heretical writings were quoted in defending the faith.
In addition, the Orthodox churches and writings far outnumbered those of the heretical groups.
The Apostolic Rule of Faith was clearly founded on the legitimate writings of the Apostolic era. And this Rule of Faith made it possible to clearly articulate church doctrine in response to heretical arguments from heretical leaders as previously listed.
The Churches cooperated with one another, just as they did in the Apostolic Churches in the 1st century through the Apostles – mainly through trusted couriers.
In later centuries, in response to heresies of those times, the Church was forced, not only to clearly and doctrinally define those essential doctrines of the Orthodox Church (
The Rule of Faith), but also to create formal lists of those Writings the Church deemed Sacred. The four major creeds representing that Rule of Faith in order to defend against heresy are as follows:
- Apostle’s Creed (Middle of the 3rd Century, but some say: 120 AD to 250 AD)
- The Nicene-Constantinopolitan Creed (381 A.D.)
- The Chalcedonian (Creed) Definition (Adopted in 451 AD)
- Athanasian Creed (apprx. 500 AD)
The Papacy came much later. I will say that, as time went on, there was a body of leaders within what today is the Roman Catholic Church, that began to form and include tradition, other than the Rule of Faith, as actual Church Doctrine despite that fact that such traditions were never taught by the Apostles or the 1st and 2nd century Church Fathers. This also is a form of heresy.
Blessings
setst