No, you're the one comparing applies to giraffes! It matters not if Cerinthus and Marcion held to Millennialist beliefs.
Cerinthus was a legalist, separating those under the Law from the evils of the material world. Marcion separated the God of NT Grace from the God of the Law. In both cases, a separation is being made away from the substance of Christ, denying that God had come in the flesh.
These heretics were Gnostics, who elevated a kind of Gnostic spirituality over true Christian spirituality. To compare Premillennialists with these heretics simply because they advocated for a form of Premillennialism is absurd since the heretics did not adhere to the orthodoxy of Premillennialism. It's like saying you're a Mormon because you have in common with Mormons the acceptance of the Christian Bible.
If anything, these early Christian heretics confirmed the authenticity of the early embrace of the Jewish Hope. They were just affirming, though in a heretical way, the fact that the Jewish restoration would one day take place, good or bad.
Not so! Dionysius describes the millennium Cerinthus anticipated in the future. It is a classic but crude summation of many of the core tenets of modern-day Premillenialism.
Cerinthus, who founded the sect which was called, after him, the Cerinthian, desiring reputable authority for his fiction, prefixed the name. For the doctrine which he taught was this: that the kingdom of Christ will be an earthly one. And as he was himself devoted to the pleasures of the body and altogether sensual in his nature, he dreamed that that kingdom would consist in those things which he desired, namely, in the delights of the belly and of sexual passion, that is to say, in eating and drinking and marrying, and in festivals and sacrifices and the slaying of victims, under the guise of which he thought he could indulge his appetites with a better grace (Church History, Book III, Chapter 28).
This summary covers some of the core tenets of what we know today as Premillennialism. But the key element that is present here, but absent in the Chiliast hope, is where Dionysius describes Cerinthus’ expectation of a return to the Jewish “festivals and sacrifices and the slaying of victims.” Cerinthus saw the reintroduction of the old covenant arrangement. With the return of “festivals and sacrifices,” came (of necessity) the rebuilding of the Jewish temple and the restoration of the old covenant priesthood. This was anathema to orthodox early Christianity. It ran contrary to New Testament teaching and principles.
The early Christians writers of all shades believed that Christ was the last sacrifice for sin. They held that the old covenant was a temporary imperfect unsatisfactory covenant pointing forward to the Lord Jesus Christ and His eternal sacrifice. They taught that the new divine arrangement had superseded the shadow, type and figure.
There is no allowance made by the Patristic writers for a restoration of the Old Testament sacrifice system with its festivals and feast, its meat offerings, sin offerings, trespass offerings, burnt offerings, peace offerings and drink offerings. They made no mention, as today, of “memorial sacrifices.” That is a modern man-made extra-biblical term that is rabbited by the masses in order to justify the unjustifiable.
The old imperfect sacrifices made by the representative priests in the old covenant were
superseded at the cross by the one final satisfactory sacrifice by the one true eternal priest – the Lord Jesus Christ. Man has now only one true heavenly high priest and requires none other. The new covenant with a new priesthood had eternally removed the old covenant with the old priesthood.
Eusebius the historian records Caius of Rome, (17 December, AD 283 to 22 April, AD 296), in his criticism of Cerinthus. He does not go into all the detail of Dionysius, but makes general sweeping statements in regard to his Premillennialism:
By means of revelations which he pretends were written by a great apostle, brings before us marvelous things which he falsely claims were shown him by angels; and he says that after the resurrection the kingdom of Christ will be set up on earth, and that the flesh dwelling in Jerusalem will again be subject to desires and pleasures. And being an enemy of the Scriptures of God, he asserts, with the purpose of deceiving men, that there is to be a period of a thousand years for marriage festivals (Church History, Book III, Chapter 28).
Cerinthus was a follower and advocate of the Jewish law, something Epiphanius (who was Bishop of Constantia in Cyprus, 310-403AD) alludes to in his writings:
Cerinthus … adhered in part to Judaism. He, however, claims that the Law and prophets have been given by the angels, and the law-giver is one of the angels who have made the world (The Panarion, Against Cerinthians or Merinthians, 1:3).
He goes on to allege:
Cerinthus stirred the circumcised multitudes up over Peter on his return to Jerusalem by saying, “He went in to men uncircumcised.” Cerinthus did this before preaching his doctrine in Asia and falling into the deeper pit of his destruction. For, because he was circumcised himself he sought an excuse, through circumcision if you please, for his opposition to the uncircumcised believers (The Panarion, Against Cerinthians or Merinthians, 2:5-6).
Theodoret (Antioch Syria, died October 22, 362) also strongly repudiates Cerinthus and his false teaching, saying:
For, unlike that of Cerinthus and of those whose views are similar to his, the kingdom of our God and Saviour is not to be of this earth, nor circumscribed by a specific time. Those men create for themselves in imagination a period of a thousand years, and luxury that will pass, and other pleasures, and along with them, sacrifices and Jewish solemnities. As for ourselves, we await the life that knows no growing old (Compendium of Heretics’ Fables, 5.21).
This is the simplistic early overview of modern day Premilennialism. It is what they teach and preach. Little do many know, but, the ancient source of their teaching is the ancient Judaizing heretics. The cross does not seem satisfactory, efficacious and final enough for this founder of early Premillennialist. He wrongly and strongly promoted the full reinstitution of the redundant old covenant arrangement with its multiple additional sin offerings to atone for the sins of man in the future. The “sacrifices and Jewish solemnities” endorsed to arise in a future millennium refers to the full gamut of the Old Testament Mosaic sacrifice system. Cerinthus is the first promoter of a thousand years of blood-letting surrounding the abolished old covenant feasts and festivals.
