But what if the works of the church fathers were destroyed? What could we learn about Jesus and about Christians from sources outside of the Bible and outside the writings of the church fathers? (note that in what follows I am not even referencing history and archaeology affirming the Old Testament and much more that affirms the New Testament)
We could learn a number of claims regarding Jesus:
A person named Jesus (Yeshu, Yeshuah, etc.) existed.
We now continue consider the dating of the New Testament.
Note that Irenaeus (120-202 AD) wrote the following in Against Heresies III.11.7,
So firm is the ground upon which these Gospels rest, that the very heretics themselves bear witness to them, and, starting from these (documents) each one of them endeavors to establish his own particular doctrine.
Irenaeus also declared the following of Matthew, Mark, Luke and John in Against Heresies III.11.8,
As for the New Testament; we have more manuscripts and earlier manuscripts which have been more accurately copied than any other book from antiquity. We have circa 5,700 Greek manuscripts which total circa 24,000 when we include other languages such as Latin, Ethiopic, Slavic, Armenian, Syriac Pashetta, Bohairic, Arabic, Old Latin, Anglo Saxon, Gothic, Sogdian, Old Syriac, Persian and Frankish.
Having concluded a consideration of various biblical statements which demonstrate that God is a Triune being, a Trinity, as each member of the Trinity is identified by likewise attributes, each is a person, each is co-equal and co-eternal let us now consider various anti-Trinitarian views.