What would the theology of Calvinism been called in AD180? Gnostic Heresy.

Ireneaus' work so thoroughly dismantles the later monergism of Augustine and Calvin, that it is no wonder that modern Calvinists are so ignorant of Early Church History. Maybe that is why reading the Patristic writers has caused so many of my Reformed friends to abandon their Gnostic and Pagan ideas for the Apostolic faith and understanding that we find all throughout Irenenaus' writings and EVERY SINGLE OTHER Early Christian leader, theologian, and apologist!

Don't believe me?  Read the following from Irenaeus for yourself...

If, however, you will not believe in Him, and will flee [walk away] from His hands, the cause of imperfection shall be in you who did not obey, but not in Him who called [you]. For He commissioned [messengers] to call people to the marriage, but they who did not obey Him deprived themselves of the royal supper. Matthew 22:3, etc. The skill of God, therefore, is not defective, for He has power of the stones to raise up children to Abraham; Matthew 3:9 but the man who does not obtain it is the cause to himself of his own imperfection. Nor, [in like manner], does the light fail because of those who have blinded themselves; but while it remains the same as ever, those who are [thus] blinded are involved in darkness through their own fault. The light does never enslave any one by necessity; nor, again, does God exercise compulsion upon anyone unwilling to accept the exercise of His skill. Those persons, therefore, who have apostatized from the light given by the Father, and transgressed the law of liberty, have done so through their own fault, since they have been created free agents, and possessed of power over themselves… Submission to God is eternal rest, so that they who shun the light have a place worthy of their flight; and those who fly from eternal rest, have a habitation in accordance with their fleeing. Now, since all good things are with God, they who by their own determination fly from God, do defraud themselves of all good things; and having been [thus] defrauded of all good things with respect to God, they shall consequently fall under the just judgment of God. For those persons who shun rest shall justly incur punishment, and those who avoid the light shall justly dwell in darkness. For as in the case of this temporal light, those who shun it do deliver themselves over to darkness, so that they do themselves become the cause to themselves that they are destitute of light, and do inhabit darkness; and, as I have already observed, the light is not the cause of such an [unhappy] condition of existence to them; so those who fly from the eternal light of God, which contains in itself all good things, are themselves the cause to themselves of their inhabiting eternal darkness, destitute of all good things, having become to themselves the cause of [their consignment to] an abode of that nature.

Against Heresies (Book 4, Chapter 39)