Nope!
Just a few writings
Our teacher of these things is Jesus Christ, who also was born for this purpose, and was crucified under Pontius Pilate, procurator of Judea, in the times of Tiberius Caesar; and that we reasonably worship Him, having learned that He is the Son of the true God Himself, and holding Him in the second place, and the prophetic Spirit in the third, we will prove.” Justin Martyr, First Apology, 13 (A.D. 155).
“[T]he ever-truthful God, hast fore-ordained, hast revealed beforehand to me, and now hast fulfilled. Wherefore also I praise Thee for all things, I bless Thee, I glorify Thee, along with the everlasting and heavenly Jesus Christ, Thy beloved Son, with whom, to Thee, and the Holy Ghost, be glory both now and to all coming ages. Amen.” Martyrdom of Polycarp 14 (A.D. 157).
“For God did not stand in need of these [beings], in order to the accomplishing of what He had Himself determined with Himself beforehand should be done, as if He did not possess His own hands. For with Him were always present the Word and Wisdom, the Son and the Spirit, by whom and in whom, freely and spontaneously, He made all things, to whom also He speaks, saying, ‘Let Us make man after Our image and likeness;’ He taking from Himself the substance of the creatures [formed], and the pattern of things made, and the type of all the adornments in the world.” Irenaeus, Against Heresies, 4,20:1 (A.D. 180).
“And first, they taught us with one consent that God made all things out of nothing; for nothing was coequal with God: but He being His own place, and wanting nothing, and existing before the ages, willed to make man by whom He might be known; for him, therefore, He prepared the world. For he that is created is also needy; but he that is uncreated stands in need of nothing. God, then, having His own Word internal within His own bowels, begat Him, emitting Him along with His own wisdom before all things. He had this Word as a helper in the things that were created by Him, and by Him He made all things. He is called governing principle’ (arche), because He rules, and is Lord of all things fashioned by Him. He, then, being Spirit of God, and governing principle, and wisdom, and power of the highest, came down upon the prophets, and through them spoke of the creation of the world and of all other things. For the prophets were not when the world came into existence, but the wisdom of God which was in Him, and His holy Word which was always present with Him. Wherefore He speaks thus by the prophet Solomon: When He prepared the heavens I was there, and when He appointed the foundations of the earth I was by Him as one brought up with Him.’ And Moses, who lived many years before Solomon, or, rather, the Word of God by him as by an instrument, says, In the beginning God created the heaven and the earth.’” Theophilus of Antioch, To Autolycus, II:10 (c. A.D. 181).
“In the course of time, then, the Father forsooth was born, and the Father suffered, God Himself, the Lord Almighty, whom in their preaching they declare to be Jesus Christ. We, however, as we indeed always have done and more especially since we have been better instructed by the Paraclete, who leads men indeed into all truth), believe that there is one only God, but under the following dispensation, or oikonomia, as it is called, that this one only God has also a Son, His Word, who proceeded from Himself, by whom all things were made, and without whom nothing was made. Him we believe to have been sent by the Father into the Virgin, and to have been born of her—being both Man and God, the Son of Man and the Son of God, and to have been called by the name of Jesus Christ; we believe Him to have suffered, died, and been buried, according to the Scriptures, and, after He had been raised again by the Father and taken back to heaven, to be sitting at the right hand of the Father, and that He will come to judge the quick and the dead; who sent also from heaven from the Father, according to His own promise, the Holy Ghost, the Paraclete, the sanctifier of the faith of those who believe in the Father, and in the Son, and in the Holy Ghost. That this rule of faith has come down to us from the beginning of the gospel, even before any of the older heretics, much more before Praxeas, a pretender of yesterday, will be apparent both from the lateness of date which marks all heresies, and also from the absolutely novel character of our new-fangled Praxeas.” Tertullian, Against Praxeas, 2 (post A.D. 213).
“[T]he statements made regarding Father, Son, and Holy Spirit are to be understood as transcending all time, all ages, and all eternity. For it is the Trinity alone which exceeds the comprehension not only of temporal but even of eternal intelligence; while other things which are not included in it are to be measured by times and ages.” Origen, First Principles, 4:28 (A.D. 230).
“”Next, I may reasonably turn to those who divide and cut to pieces and destroy that most sacred doctrine of the Church of God, the Divine Monarchy, making it as it were three powers and partitive subsistences and god-heads three. I am told that some among you who are catechists and teachers of the Divine Word, take the lead in this tenet, who are diametrically opposed, so to speak, to Sabellius’s opinions; for he blasphemously says that the Son is the Father, and the Father the Son, but they in some sort preach three Gods, as dividing the sacred Monad into three subsistences foreign to each other and utterly separate. For it must needs be that with the God of the Universe, the Divine Word is united, and the Holy Ghost must repose and habitate in God; thus in one as in a summit, I mean the God of the Universe, must the Divine Triad be gathered up and brought together. For it is the doctrine of the presumptuous Marcion, to sever and divide the Divine Monarchy into three origins,—a devil's teaching, not that of Christ's true disciples and lovers of the Saviour's lessons, For they know well that a Triad is preached by divine Scripture, but that neither Old Testament nor New preaches three Gods.” Pope Dionysius [regn. 260-268], to Dionysius of Alexandria, fragment in Athanasius’ Nicene Definition 26 (A.D. 262).
“Equally must one censure those who hold the: Son to be a work, and consider that the Lord has come into being, as one of things which really came to be; whereas the divine oracles witness to a generation suitable to Him and becoming, but not to any fashioning or making. A blasphemy then is it, not ordinary, but even the highest, to say that the Lord is in any sort a handiwork. For if He came to be Son, once He was not; but He was always, if (that is) He be in the Father, as He says Himself, and if the Christ be Word and Wisdom and Power (which, as ye know, divine Scripture says), and these attributes be powers of God. If then the Son came into being, once these attributes were not; consequently there was a time, when God was without them; which is most absurd…
Neither then may we divide into three Godheads the wonderful and divine Monad; nor disparage with the name of ‘work’ the dignity and exceeding majesty of the Lord; but we must believe in God the Father Almighty, and in Christ Jesus His Son, and in the Holy Ghost, and hold that to the God of the universe the Word is united. For ‘I,’ says He, ‘and the Father are one; ‘and, ‘I in the Father and the Father in Me.’ For thus both the Divine Triad, and the holy preaching of the Monarchy, will be preserved.” Pope Dionysius [regn. 260-268], to Dionysius of Alexandria, fragment in Athanasius’ Nicene Definition 26 (A.D. 262).
Nor would I argue that trinitarianism was not a doctrine of the early church. Therefore, it WAS a doctrine of the early church and deserves our deepest attention.
As this article points out, premillennialism also was a doctrine of the early church.