Those are actually rather unfortunate examples if your thesis is that Rome simply invented new doctrines.
Let us begin with transubstantiation.
If your objection is merely that the technical vocabulary of transubstantiation developed later, then of course it did. But that is not the same thing as saying that the underlying doctrine (the real conversion of the Eucharistic elements into Christ’s Body and Blood) was invented by medieval Rome.
Ignatius of Antioch, at the beginning of the second century, condemns those who refuse the Eucharist because they do not confess it to be the flesh of Jesus Christ.
Justin Martyr, around the middle of the second century, says that Christians do not receive the Eucharist as ordinary bread and drink, but as the flesh and blood of the incarnate Christ.
Cyril of Jerusalem is more explicit still: the bread and wine are not to be regarded as “bare elements”; Christ declared them to be His Body and Blood, and after the invocation the bread “becomes the Body of Christ” and the wine His Blood.
Whatever one wishes to call that, “a philosophical musing invented by Rome” is not a serious historical description of it.
And the Eastern Orthodox evidence makes the objection even more difficult.
When Lutheran theologians submitted the Augsburg Confession to Patriarch Jeremias II of Constantinople in the sixteenth century, hoping to discover that the ancient Eastern Church was essentially Protestant, Jeremias rejected numerous Lutheran doctrines rather than embracing them.
The Orthodox Synod of Jerusalem in 1672 later explicitly approved those responses. Its language about the Reformation was hardly ecumenically delicate: it referred to the “madness of Luther,” treated Lutheran and Calvinist innovations as heretical departures, and on the Eucharist specifically rejected what it attributed to Luther’s followers.
More importantly, Decree XVII of that Orthodox Synod states that after consecration the bread is “transmuted, transubstantiated, converted and transformed” into Christ’s true Body and the wine into His true Blood. It explicitly denies that Christ is present merely “typically” or “figuratively,” and even explains that by “transubstantiation” it does not claim to explain the mysterious manner of the change, but affirms that the change is real and substantial.
So this cannot plausibly be dismissed as some peculiarly Roman medieval philosophical speculation.
Indeed, if anything, the Orthodox position makes the problem even worse because they preserved an emphatically realist Eucharistic doctrine and later formally condemned Protestant attempts to reduce or reconceive it.
Now, the Immaculate Conception is historically a different case, and accuracy is very important.
I would not claim that Irenaeus, Ephrem, Augustine, or John Damascene could have recited the dogmatic definition of 1854. They could not. The precise question developed gradually and was genuinely disputed.
But once again, “therefore Rome invented it” does not follow.
The patristic trajectory is unmistakable.
Already in the second century Irenaeus constructs the great Eve–Mary parallel: Eve’s disobedience is undone by Mary’s obedience, and Mary becomes the counterpart through whom the knot tied by Eve is untied.
Ephrem the Syrian goes substantially further. Speaking of Christ and Mary, he says that in Christ there is no blemish and in His Mother “no stain.”
Augustine, when discussing the universality of personal sin among the saints, expressly refuses to include the Virgin Mary, saying that concerning her he wishes “to raise no question” where sin is concerned, precisely because of the extraordinary grace bestowed upon her in view of Christ.
And the Eastern tradition becomes still more striking. John Damascene, preaching on Mary’s nativity, speaks of Joachim producing a “wholly unblemished seed” and of Anne carrying an “all-holy infant”; he describes nature itself yielding to grace in preparation for Mary’s conception and birth.
Andrew of Crete likewise speaks of the “Immaculate Virgin” emerging from the womb and treats her origin as the extraordinary preparation for the Incarnation.
Do those passages amount, individually, to the precise scholastic proposition defined in 1854, that Mary, from the first instant of her conception, was preserved from original sin by a singular grace of God in view of Christ’s merits?
No.
But that is precisely what doctrinal development means.
There is an enormous difference between saying: “The final technical formulation was not present from the beginning” and saying: “The underlying belief has no roots in the earlier Christian tradition and was simply invented.”
The first is historically true of many Christian doctrines (including the Trinity)
The second requires proof.
And if your criterion is that a doctrine is illegitimate unless its final technical formulation appears verbatim in Scripture or in the earliest Fathers, you have created a standard that would cause considerable trouble for Nicene and Chalcedonian Christianity as well. The Apostles don’t speak in the later technical vocabulary of homoousios, one person in two natures, or the developed terminology of Trinitarian theology. The Church later formulated more precisely what it believed was already contained in the apostolic faith.
That is exactly the distinction Catholic theology makes here: development is not new revelation.
So the two examples unfortunately don’t establish your accusation.
