Heretics claim angels formed creation, but only God did

Those, moreover, who say that the world was formed by angels, or by any other maker of it, contrary to the will of Him who is the Supreme Father, err first of all in this very point, that they maintain that angels formed such and so mighty a creation, contrary to the will of the Most High God.

…With justice, therefore, according to an analogous process of reasoning, the Father of all will be declared the Former of this world, and not the angels, nor any other [so-called] former of the world, other than He who was its Author, and had formerly been the cause of the preparation for a creation of this kind.

…He formed all things that were made by His Word that never wearies. For this is a peculiarity of the pre-eminence of God, not to stand in need of other instruments for the creation of those things which are summoned into existence. His own Word is both suitable and sufficient for the formation of all things, even as John, the disciple of the Lord, declares regarding Him: “All things were made by Him, and without Him was nothing made.”

Irenaeus of Lyons
Against Heresies Book II
Chapter II

Heresies give birth to other heresies and continue to divide

Many offshoots of numerous heresies have already been formed from those heretics we have described. This arises from the fact that numbers of them—indeed, we may say all—desire themselves to be teachers, and to break off from the particular heresy in which they have been involved. Forming one set of doctrines out of a totally different system of opinions, and then again others from others, they insist upon teaching something new, declaring themselves the inventors of any sort of opinion which they may have been able to call into existence.

Irenaeus of Lyons
Against Heresies Book I
Chapter XXVIII

God did not create through angels

There is no exception or deduction stated; but the Father made all things by Him, whether visible or invisible, objects of sense or of intelligence, temporal, on account of a certain character given them, or eternal; and these eternal things He did not make by angels, or by any powers separated from His Ennœa.

Irenaeus of Lyons
Against Heresies Book I
Chapter XXII

Faith is received through the Church

But such spirits as are commanded by these men, and speak when they desire it, are earthly and weak, audacious and impudent, sent forth by Satan for the seduction and perdition of those who do not hold fast that well-compacted faith which they received at first through the Church.

Irenaeus of Lyons
Against Heresies Book I
Chapter XIII

No one adds or removes from the tradition of the Church

Nor will any one of the rulers in the Churches, however highly gifted he may be in point of eloquence, teach doctrines different from these (for no one is greater than the Master); nor, on the other hand, will he who is deficient in power of expression inflict injury on the tradition. For the faith being ever one and the same, neither does one who is able at great length to discourse regarding it, make any addition to it, nor does one, who can say but little diminish it.

Irenaeus of Lyons
Against Heresies Book I
Chapter X

The Church hands down the tradition that has been preserved from the Apostles

As I have already observed, the Church, having received this preaching and this faith, although scattered throughout the whole world, yet, as if occupying but one house, carefully preserves it. She also believes these points [of doctrine] just as if she had but one soul, and one and the same heart, and she proclaims them, and teaches them, and hands them down, with perfect harmony, as if she possessed only one mouth. For, although the languages of the world are dissimilar, yet the import of the tradition is one and the same. For the Churches which have been planted in Germany do not believe or hand down anything different, nor do those in Spain, nor those in Gaul, nor those in the East, nor those in Egypt, nor those in Libya, nor those which have been established in the central regions of the world.

Irenaeus of Lyons
Against Heresies Book I
Chapter X

The Apostolic Faith (similar to creeds)

The Church, though dispersed through our the whole world, even to the ends of the earth, has received from the apostles and their disciples this faith: [She believes] in 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 [future] 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; that He may send “spiritual wickednesses,” and the angels who transgressed and became apostates, together with the ungodly, and unrighteous, and wicked, and profane among men, into everlasting fire; but may, in the exercise of His grace, confer immortality on the righteous, and holy, and those who have kept His commandments, and have persevered in His love, some from the beginning [of their Christian course], and others from [the date of] their repentance, and may surround them with everlasting glory.

Irenaeus of Lyons
Against Heresies Book I
Chapter X