One reason our faith should be based on scripture alone is that it was very easy to give an "orthodox" [at the time] slant to writings in an age when everything was copied by hand. There is evidence that even scripture was altered ("The Orthodox Corruption of Scripture - The Effect of Early Christological Controversies on the Text of the New Testament" by Bart D.Ehrman [OUP,1993] gives many examples), but this was the exception in view of the reverence in which it was held and the dire warnings in the Bible about alteration.
Nevertheless, we have to be guided by what we have and the extant writings of the early Christians do show their beliefs were far from the subequent definitions of who and what God is. Let it first be said that the Bible describes Jesus as God, most notably at John 1:1, and this has not been contended by the early Christians, the Arian movement of the fourth century, or JWs today. What is in dispute is whether he is the same as God the Father, and a related dispute is whether he was God while he was man. The trinity doctrine includes the teaching that "the Father is God, the Son is God, and the Holy Ghost is God. And yet there are not three Gods, but one God." So with this in mind, let us consider the writings of the second century to which you refer. By the third century, the philosophical schools of Plato and Philo were in full swing and both Tertullian (within his lifetime) and Origen were declared heretics so although their beliefs were far from the Athanasian Creed I would not give them the same weight as earlier Christian writers.
Polycarp (70-155/160). Bishop of Smyrna. Disciple of John the Apostle.
"O Lord God almighty...I bless you and glorify you through the eternal and heavenly high priest Jesus Christ, your beloved Son, through whom be glory to you, with Him and the Holy Spirit, both now and forever" (n. 14, ed. Funk; PG 5.1040).
This was, in fact, not Polycarp but Marcion quoting Polycarp in his '
Martyrdom'. At the beginning of this prayer he says : "O Lord God Almighty, Father of your blessed and beloved Son Jesus Christ, through whom we have been given knowledge of yourself..." and concludes it as you relate.
In Polycarp's own writings he teaches that we are saved "by the will of God through Jesus Christ" and that Jesus was himself rescued by God from "the pangs of the grave" (chapter 1 of his letter to the Phillipians).
In chapter 2 he writes "Put your trust in Him who raised our Lord Jesus Christ from the dead, and gave Him glory and a seat at His own right hand."
In chapter 12 he writes "May the God and Father of our Lord Jesus Christ, and the eternal High Priest Jesus Christ Himself, the Son of God, help you to grow in faith and truth..."
Justin Martyr (100-165). He was a Christian apologist and martyr.
"For, in the name of God, the Father and Lord of the universe, and of our Savior Jesus Christ, and of the Holy Spirit, they then receive the washing with water" (First Apol., LXI).
This discussion of the baptism ceremony by Justin is simply a reflection of Matthew 28 and does not suggest anything beyond that.
In contrast, in chapter 12 of his First Apology he speaks of "that Word no other than who, after God the Father, we know to be the most noble and just prince".
In chapter 16 "And he [Jesus] thus persuaded us to worship God alone, and no other...and when one came to him and said, 'Good Master,' he answered, 'there is none good but God alone,' who made all things. Hence we render worship to God alone...".
In chapter 32 "The Son or Logos is, 'the first power after God the Father and Sovereign Lord'".
Ignatius of Antioch (died 98/117). Bishop of Antioch. He wrote much in defense of Christianity.
"In Christ Jesus our Lord, by whom and with whom be glory and power to the Father with the Holy Spirit for ever" (n. 7; PG 5.988).
"We have also as a Physician the Lord our God Jesus the Christ the only-begotten Son and Word, before time began, but who afterwards became also man, of Mary the virgin. For ‘the Word was made flesh.' Being incorporeal, He was in the body; being impassible, He was in a passable body; being immortal, He was in a mortal body; being life, He became subject to corruption, that He might free our souls from death and corruption, and heal them, and might restore them to health, when they were diseased with ungodliness and wicked lusts." (Alexander Roberts and James Donaldson, eds., The ante-Nicene Fathers, Grand Rapids: Eerdmans, 1975 rpt., Vol. 1, p. 52, Ephesians 7.)
As previously noted it should come as no surprise that Jesus is described as God, the issue simply being whether he is one and the same or subordinate to God the Father.
In chapter 3 of this letter to the Ephesians Ignatius writes "I venture to recommend an action that reflects the mind of God. For we have no life apart from Jesus Christ; and as he represents the mind of the Father, so our bishops, even those who are stationed in the remotest parts of the world, represent the mind of Jesus Christ."
In chapter 5 "If I myself reached such intimacy with your bishop in a brief space of time...how much more fortunate I must count you, who are as inseparably one with him as the church is with Jesus Christ and Jesus Christ with the Father."
He concludes this letter in chapter 20 "I hope to write you a further letter-if, in answer to your prayers, Jesus Christ allows it, and God so wills-in which I will continue this preliminary account for you of God's design for the New Man, Jesus Christ...Farewell to you, in God the Father and in Jesus Christ, who is our common hope."
Irenaeus (115-190). As a boy he listened to Polycarp, the disciple of John. He became Bishop of Lyons.
"The Church, though dispersed throughout the whole world, even to the ends of the earth, has received from the apostles and their disciples this faith: ...one God, the Father Almighty, Maker of heaven, and earth, and the sea, and all things that are in them; and in one Christ Jesus, the Son of God, who became incarnate for our salvation; and in the Holy Spirit, who proclaimed through the prophets the dispensations of God, and the advents, and the birth from a virgin, and the passion, and the resurrection from the dead, and the ascension into heaven in the flesh of the beloved Christ Jesus, our Lord, and His manifestation from heaven in the glory of the Father ‘to gather all things in one,' and to raise up anew all flesh of the whole human race, in order that to Christ Jesus, our Lord, and God, and Savior, and King, according to the will of the invisible Father, ‘every knee should bow, of things in heaven, and things in earth, and things under the earth, and that every tongue should confess; to him, and that He should execute just judgment towards all...'" (Against Heresies X.l)
Again, it is no surprise that Jesus is described as God but would be if he were equated with his Father. On the contrary, in this passage he distinguishes between Jesus and his Father just as Paul does in his letter to the Philippians where he says that "every tongue will confess that Jesus Christ is Lord, to the glory of God the Father", or "to the will of the invisible Father".
Further, in chapter 22 of this book against the Valentinians he specifies the one rule of faith, namely that "there is one God Almighty who created all things by His Word...He is the Father of our Lord Jesus Christ, as we shall show."
The facts are that none of the early Christian writers taught that Jesus was the same as his Father, and it is only in the fourth century that the Athanasian schism asserted they were the same substance. That, of course, is another age and far from the simplicity of the time of Christ.
Earnest
"Beware the Jubjub bird, and shun the frumious Bandernatch!" - Rev. Charles Dodgson