God created all things out of nothing, not forming them from any existing material

If any material was necessary to God in the creation of the world, as Hermogenes supposed, God had a far nobler and more suitable one in His own wisdom—one which was not to be gauged by the writings of philosophers, but to be learnt from the words or prophets. This alone, indeed, knew the mind of the Lord. For “who knoweth the things of God, and the things in God, but the Spirit, which is in Him?” Now His wisdom is that Spirit. This was His counsellor, the very way of His wisdom and knowledge. Of this He made all things, making them through It, and making them with It.

Tertullian
Against Hermogenes
Chapter XVIII

We are made gods by grace and not by any property of our own

Well, then, you say, we ourselves at that rate possess nothing of God. But indeed we do, and shall continue to do—only it is from Him that we receive it, and not from ourselves. For we shall be even gods, if we, shall deserve to be among those of whom He declared, “I have said, Ye are gods,” and, “God standeth in the congregation of the gods.” But this comes of His own grace, not from any property in us, because it is He alone who can make gods.

Tertullian
Against Hermogenes
Chapter V

There is only one God and Father of all

For “although there be that are called gods” in name, “whether in heaven or in earth, yet to us there is but one God the Father, of whom are all things;” whence the greater reason why, in our view, that which is the property of God ought to be regarded as pertaining to God alone, and why (as I have already said) that should cease to be such a property, when it is shared by another being. Now, since He is God, it must necessarily be a unique mark of this quality, that it be confined to One. Else, what will be unique and singular, if that is not which has nothing equal to it? What will be principal, if that is not which is above all things, before all things, and from which all things proceed? By possessing these He is God alone, and by His sole possession of them He is One.  If another also shared in the possession, there would then be as many gods as there were possessors of these attributes of God.

Tertullian
Against Hermogenes
Chapter IV

Hermogenes denies Christ created all things out of nothing

He is a thorough adulterer, both doctrinally and carnally, since he is rank indeed with the contagion of your marriage-hacks, and has also failed in cleaving to the rule of faith as much as the apostle’s own Hermogenes. However, never mind the man, when it is his doctrine which I question. He does not appear to acknowledge any other Christ as Lord, though he holds Him in a different way; but by this difference in his faith he really makes Him another being,—nay, he takes from Him everything which is God, since he will not have it that He made all things of nothing.

Tertullian
Against Hermogenes
Chapter I

Jesus humanity and divinity are evident from reading Paul

It is well for us that in another passage (the apostle) calls Christ “the image of the invisible God.” For will it not follow with equal force from that passage, that Christ is not truly God, because the apostle places Him in the image of God, if, (as Marcion contends,) He is not truly man because of His having taken on Him the form or image of a man? For in both cases the true substance will have to be excluded, if image (or “fashion”) and likeness and form shall be claimed for a phantom. But since he is truly God, as the Son of the Father, in His fashion and image, He has been already by the force of this conclusion determined to be truly man, as the Son of man, “found in the fashion” and image “of a man.”  For when he propounded Him as thus “found” in the manner of a man, he in fact affirmed Him to be most certainly human. For what is found, manifestly possesses existence. Therefore, as He was found to be God by His mighty power, so was He found to be man by reason of His flesh, because the apostle could not have pronounced Him to have “become obedient unto death,” if He had not been constituted of a mortal substance.

Tertullian
The Five Books Against Marcion, Book V
Chapter XX

God created out of nothing and will restore the flesh at the resurrection

But (once for all) let Marcion know that the principle term of his creed comes from the school of Epicurus, implying that the Lord is stupid and indifferent; wherefore he refuses to say that He is an object to be feared. Moreover, from the porch of the Stoics he brings out matter, and places it on a par with the Divine Creator. He also denies the resurrection of the flesh,—a truth which none of the schools of philosophy agreed together to hold. But how remote is our (Catholic) verity from the artifices of this heretic, when it dreads to arouse the anger of God, and firmly believes that He produced all things out of nothing, and promises to us a restoration from the grave of the same flesh (that died) and holds without a blush that Christ was born of the virgin’s womb!

Tertullian
The Five Books Against Marcion, Book V
Chapter XIX

Christ is before all things — eternally begotten

He calls Christ “the image of the invisible God.” We in like manner say that the Father of Christ is invisible, for we know that it was the Son who was seen in ancient times (whenever any appearance was vouchsafed to men in the name of God) as the image of (the Father) Himself. He must not be regarded, however, as making any difference between a visible and an invisible God; because long before he wrote this we find a description of our God to this effect: “No man can see the Lord, and live.” If Christ is not “the first-begotten before every creature,” as that “Word of God by whom all things were made, and without whom nothing was made;” if “all things were” not “in Him created, whether in heaven or on earth, visible and invisible, whether they be thrones or dominions, or principalities, or powers;” if “all things were” not “created by Him and for Him” (for these truths Marcion ought not to allow concerning Him), then the apostle could not have so positively laid it down, that “He is before all.” For how is He before all, if He is not before all things? How, again, is He before all things, if He is not “the first-born of every creature”—if He is not the Word of the Creator? Now how will he be proved to have been before all things, who appeared after all things?  Who can tell whether he had a prior existence, when he has found no proof that he had any existence at all?

Tertullian
The Five Books Against Marcion, Book V
Chapter XIX

Heresy is defined by being new — it can’t be traced back to the beginning

I am accustomed in my prescription against all heresies, to fix my compendious criterion (of truth) in the testimony of time; claiming priority therein as our rule, and alleging lateness to be the characteristic of every heresy. This shall now be proved even by the apostle, when he says: “For the hope which is laid up for you in heaven, whereof ye heard before in the word of the truth of the gospel; which is come unto you, as it is unto all the world.” For if, even at that time, the tradition of the gospel had spread everywhere, how much more now! Now, if it is our gospel which has spread everywhere, rather than any heretical gospel, much less Marcion’s, which only dates from the reign of Antoninus, then ours will be the gospel of the apostles.  But should Marcion’s gospel succeed in filling the whole world, it would not even in that case be entitled to the character of apostolic.

Tertullian
The Five Books Against Marcion, Book V
Chapter XIX

Man is justified by the righteousness of God which is the faith of Christ

It was once the law; now it is “the righteousness of God which is by the faith of (Jesus) Christ.” What means this distinction? Has your god been subserving the interests of the Creator’s dispensation, by affording time to Him and to His law? Is the “Now” in the hands of Him to whom belonged the “Then”? Surely, then, the law was His, whose is now the righteousness of God. It is a distinction of dispensations, not of gods.  He enjoins those who are justified by faith in Christ and not by the law to have peace with God.

…Now, as peace is only possible towards Him with whom there once was war, we shall be both justified by Him, and to Him also will belong the Christ, in whom we are justified by faith, and through whom alone God’s enemies can ever be reduced to peace.

Tertullian
The Five Books Against Marcion, Book V
Chapter XIV

Man appears before the judgment seat of Christ in the body

In this view it is that he informs us how “we must all appear before the judgement-seat of Christ, that every one may receive the things done in his body, according as he hath done either good or bad.” Since, however, there is then to be a retribution according to men’s merits, how will any be able to reckon with God? But by mentioning both the judgment-seat and the distinction between works good and bad, he sets before us a Judge who is to award both sentences, and has thereby affirmed that all will have to be present at the tribunal in their bodies. For it will be impossible to pass sentence except on the body, for what has been done in the body. God would be unjust, if any one were not punished or else rewarded in that very condition, wherein the merit was itself achieved.

Tertullian
The Five Books Against Marcion, Book V
Chapter XII