John 1:1 can only be interpreted to mean one thing — Christ is God but distinct from the Father

…first of all there comes at once to hand the preamble of John to his Gospel, which shows us what He previously was who had to become flesh.  “In the beginning was the Word, and the Word was with God, and the Word was God. He was in the beginning with God: all things were made by Him, and without Him was nothing made.” Now, since these words may not be taken otherwise than as they are written, there is without doubt shown to be One who was from the beginning, and also One with whom He always was: one the Word of God, the other God (although the Word is also God, but God regarded as the Son of God, not as the Father); One through whom were all things, Another by whom were all things.  But in what sense we call Him Another we have already often described. In that we called Him Another, we must needs imply that He is not identical—not identical indeed, yet not as if separate; Other by dispensation, not by division.

Tertullian
Against Praxeas
Chapter XXI

Praxeas’ heresy mistakenly uses a few passages against a great many

For, inasmuch as only a few testimonies are to be found (making for them) in the general mass, they pertinaciously set off the few against the many, and assume the later against the earlier. The rule, however, which has been from the beginning established for every case, gives its prescription against the later assumptions, as indeed it also does against the fewer.

Tertullian
Against Praxeas
Chapter XX

The persons of the Godhead do not make multiple gods

Therefore, if they have determined that the Father and the Son must be regarded as one and the same, for the express purpose of vindicating the unity of God, that unity of His is preserved intact; for He is one, and yet He has a Son, who is equally with Himself comprehended in the same Scriptures. Since they are unwilling to allow that the Son is a distinct Person, second from the Father, lest, being thus second, He should cause two Gods to be spoken of, we have shown above that Two are actually described in Scripture as God and Lord. And to prevent their being offended at this fact, we give a reason why they are not said to be two Gods and two Lords, but that they are two as Father and Son; and this not by severance of their substance, but from the dispensation wherein we declare the Son to be undivided and inseparable from the Father,—distinct in degree, not in state. And although, when named apart, He is called God, He does not thereby constitute two Gods, but one; and that from the very circumstance that He is entitled to be called God, from His union with the Father.

Tertullian
Against Praxeas
Chapter XIX

It is still correct to say that the Word created alone

Inasmuch, then, as the heaven was prepared when Wisdom was present in the Word, and since all things were made by the Word, it is quite correct to say that even the Son stretched out the heaven alone, because He alone ministered to the Father’s work. It must also be He who says, “I am the First, and to all futurity I AM.” The Word, no doubt, was before all things.

Tertullian
Against Praxeas
Chapter XIX

The Son shares the titles of the Father also

“All things,” says He, “which the Father hath are mine.” Then why not His names also? When, therefore, you read of Almighty God, and the Most High, and the God of hosts, and the King of Israel, the “One that is,” consider whether the Son also be not indicated by these designations, who in His own right is God Almighty, in that He is the Word of Almighty God, and has received power over all; is the Most High, in that He is “exalted at the right hand of God,” as Peter declares in the Acts; is the Lord of hosts, because all things are by the Father made subject to Him; is the King of Israel because to Him has especially been committed the destiny of that nation; and is likewise “the One that is,” because there are many who are called Sons, but are not.

As if, indeed, He which is to come were not almighty; whereas even the Son of the Almighty is as much almighty as the Son of God is God.

Tertullian
Against Praxeas
Chapter XVII

The Logos interacted with the world in the Old Testament as the agent of the Father

It is the Son, therefore, who has been from the beginning administering judgment, throwing down the haughty tower, and dividing the tongues, punishing the whole world by the violence of waters, raining upon Sodom and Gomorrah fire and brimstone, as the Lord from the Lord.

…Thus was He ever learning even as God to converse with men upon earth, being no other than the Word which was to be made flesh.

…and therefore that it was uniformly one God, even the Father, who at all times did Himself the things which were really done by Him through the agency of the Son.

Tertullian
Against Praxeas
Chapter XVI

Paul beheld Christ and knew He was God

Him, too, did Paul behold; but yet he saw not the Father. “Have I not,” he says, “seen Jesus Christ our Lord?” Moreover, he expressly called Christ God, saying: “Of whom are the fathers, and of whom as concerning the flesh Christ came, who is over all, God blessed for ever.”

Tertullian
Against Praxeas
Chapter XV

The Word is God of God

Now the Word of life became flesh, and was heard, and was seen, and was handled, because He was flesh who, before He came in the flesh, was the “Word in the beginning with God” the Father, and not the Father with the Word. For although the Word was God, yet was He with God, because He is God of God; and being joined to the Father, is with the Father.

Tertullian
Against Praxeas
Chapter XV

The Son is also God and appeared to Moses

We declare, however, that the Son also, considered in Himself (as the Son), is invisible, in that He is God, and the Word and Spirit of God;

…When as we read in the Gospel, “Moses appeard talking with Jesus”—it is evident that in early times it was always in a glass, (as it were,) and an enigma, in vision and dream, that God, I mean the Son of God, appeared—to the prophets and the patriarchs, as also to Moses indeed himself. And even if the Lord did possibly speak with him face to face, yet it was not as man that he could behold His face, unless indeed it was in a glass, (as it were,) and by enigma.

Tertullian
Against Praxeas
Chapter XIV

The Trinity is three persons but not polytheism

Very well! you say, I shall challenge you to preach from this day forth (and that, too, on the authority of these same Scriptures) two Gods and two Lords, consistently with your views. God forbid, (is my reply). For we, who by the grace of God possess an insight into both the times and the occasions of the Sacred Writings, especially we who are followers of the Paraclete, not of human teachers, do indeed definitively declare that Two Beings are God, the Father and the Son, and, with the addition of the Holy Spirit, even Three, according to the principle of the divine economy, which introduces number, in order that the Father may not, as you perversely infer, be Himself believed to have been born and to have suffered, which it is not lawful to believe, forasmuch as it has not been so handed down. That there are, however, two Gods or two Lords, is a statement which at no time proceeds out of our mouth: not as if it were untrue that the Father is God, and the Son is God, and the Holy Ghost is God, and each is God; but because in earlier times Two were actually spoken of as God, and two as Lord, that when Christ should come He might be both acknowledged as God and designated as Lord, being the Son of Him who is both God and Lord. Now, if there were found in the Scriptures but one Personality of Him who is God and Lord, Christ would justly enough be inadmissible to the title of God and Lord: for (in the Scriptures) there was declared to be none other than One God and One Lord, and it must have followed that the Father should Himself seem to have come down (to earth), inasmuch as only One God and One Lord was ever read of (in the Scriptures), and His entire Economy would be involved in obscurity, which has been planned and arranged with so clear a foresight in His providential dispensation as matter for our faith.  As soon, however, as Christ came, and was recognised by us as the very Being who had from the beginning caused plurality (in the Divine Economy), being the second from the Father, and with the Spirit the third, and Himself declaring and manifesting the Father more fully (than He had ever been before), the title of Him who is God and Lord was at once restored to the Unity (of the Divine Nature), even because the Gentiles would have to pass from the multitude of their idols to the One Only God, in order that a difference might be distinctly settled between the worshippers of One God and the votaries of polytheism.

…I will therefore not speak of gods at all, nor of lords, but I shall follow the apostle; so that if the Father and the Son, are alike to be invoked, I shall call the Father “God,” and invoke Jesus Christ as “Lord.” But when Christ alone (is mentioned), I shall be able to call Him “God,” as the same apostle says: “Of whom is Christ, who is over all, God blessed for ever.” For I should give the name of “sun” even to a sunbeam, considered in itself; but if I were mentioning the sun from which the ray emanates, I certainly should at once withdraw the name of sun from the mere beam. For although I make not two suns, still I shall reckon both the sun and its ray to be as much two things and two forms of one undivided substance, as God and His Word, as the Father and the Son.

Tertullian
Against Praxeas
Chapter XIII