A surprising amount of Catholics base their faith in the truthfulness of Catholicism on Eucharistic miracles, wherein a wafer is said to bleed, or transform into flesh, Stigmata, wherein a person bleeds from their hands, feet, or side as Jesus did, and Marian apparitions, in which Mary appears to people and tells them a message.
This article will analyze these three categories of Catholic miracle claims.
The simplest refutation of Eucharistic miracles is found in observing that they did not start being reported until 1,000 years after Jesus Christ, and when they were reported, they were reported in High Middle Ages Europe, at the height of Papal excess (Pope Gregory VII's Dictatus Papae in 1090 AD claimed the Pope was the ruler of the whole world, "All princes shall kiss the feet of the Pope alone"), the age of the Crusades (Papally-mandated offensive warfare with promised Plenary Indulgences for "martyrdom" while fighting people of other religions), the brutal torture and killing of heretics (Ad Extirpanda, 1252 AD, etc.); long after the cult of the Saints had developed, and grown into a monstrosity, where superstition, illiteracy, and ignorance abounded, indulgences were sold, and ascribed to relics all over Europe, with many claiming to have the nails Jesus was crucified with, pieces of the True Cross, pieces of Mary and Jesus's clothing, the bones of Biblical figures, and so on (see Henry Charles Lea, A History of Auricular Confession and Indulgences in the Latin Church, for extensive documentation). In other words, the kind of superstition and fraud associated with Eucharistic miracles fits in well with the deep, abiding darkness that was High Middle Ages Roman Catholicism, and can be rejected on that basis alone by sober observers.
Prior to 1000 AD, there are very few claims, which come from hundreds of years after the supposed event:
So, prior to the High Middle Ages, there is seemingly a single Eucharistic miracle claim, which was written in a hagiography intended to glorify Pope Gregory, nearly two hundred years after he lived. Consider all of the Saints and great Christians who lived before the High Middle Ages, and then ask why neither they, nor the Apostles, ever reported or encountered this phenomenon. They never did so, because it is pious fraud, invented in a superstitious Catholic milieu in Europe.
Also, consider that there are many Eucharistic miracles which are preserved and stored in Catholic Churches. These people could indisputably prove the truth of Christianity, and refute all non-Catholics forever, if they gathered 4 or 5 of the Eucharistic miracles from various centuries and places, and demonstrated that they all have the same DNA - the very DNA of Jesus Christ. Will they do so? Of course not. If they did, the DNA results would not corroborate that this is the body and blood of Jesus Christ, and that is why they do not allow peer-reviewed analysis of the claimed relics by non-Catholics.
As with Eucharistic miracles, it is not until the High Middle Ages, when Francis of Assisi (1181-1226 AD) is said to have had the wounds of Jesus, that the phenomenon appears. Thereafter, there is an explosion in reported incidents. This alone is enough to dismiss the phenomenon, as if God intended for the Stigmata to be a sign for Christians, why would it be absent entirely from the early Church, and not appear until Medieval Roman Catholic Europe?
Further, conveniently, not a single claimed stigmatic has ever been recorded while the Stigmata allegedly begins to appear from otherwise undamaged skin. Instead, the wounds already exist, and then are observed. This is because it is pious fraud, perpetrated by deeply disturbed individuals, rather than a genuine miracle.
Also of note is the fact that the phenomenon is almost exclusively female, and very common in cloisters. There are also examples of claimed stigmatics being caught faking the phenomenon:
Finally, almost all stigmatics make their wounds in the hands, whereas it was likely that Jesus was pierced through the wrist, as the Greek word translated "hand" (χείρ) can accommodate the wrist area as well, and since hands cannot support a hanging person (as the breaking of the prisoner's legs to kill them indicates they hung, and pushed up with their legs to breathe, John 19:31-33), nor can they be easily pierced without breaking a bone (none of Jesus's bones were broken, John 19:36), it is likely that the people perpetrating the fraudulent Stigmata aren't even doing it correctly, and are making the wounds in the wrong area.
Marian apparitions are common throughout Middle Ages hagiographies, and became extremely popular after the 18th century.
Considering the following should demonstrate the fraudulent nature of the apparitions:
It is a sobering fact that people often maliciously lie, even when God is involved, and when lives are at stake, finding some way to either ignore their conscience, or justify it to themselves. Consider the case of the Pendle Witches (1612 AD), where the nine year-old Jennet Device was a key witness in the trial and execution of nine people for witchcraft, including her own mother, brother, and sister. Later (1633-1634 AD), in the same area, ten year-old Edmund Robinson was a key witness in the witch trials of ten people, and ultimately admitted to fabricating evidence. Such historical cases are innumerable. Additionally, people who are themselves deceived, or not sane, can deceive others when they repeat what they erroneously think is true.
In these examples, one can see the kind of superstitious religion that was birthed in Medieval Europe, epitomized in pious fraud. Mary is not appearing to illiterate Catholic children, the bread used in Catholic churches is not bleeding the very blood of Jesus Christ, and cloistered Roman Catholic nuns are not bleeding as the Lord bled.
Finally, it should be noted that as far as miracles are concerned, Pentecostals, who are part of the Radical Reformation, and canonically damned many times over by the Roman Catholic Church, have far more miracle claims than Roman Catholics. Some of them have even written multi-volume works documenting miracles, both within their own movement, and in other Protestant movements (Miracles, by Craig Keener). So, must we all be Pentecostal? The Eastern Orthodox, who canonically curse any who say that the Pope is the head of the Church (Synodikon), have many post-schism hagiographies packed with miracles (Gregory Palamas, Simeon the Myrrh-streaming, Joseph the Wonderworker, etc.). So, should we all be Orthodox? According to Johannes Bugenhagen (1485-1558 AD), Jan Hus gave a prophecy foretelling the coming of Martin Luther. Should we all be Lutheran, or Hussites? Muslims teach that Muhammad split the moon (Sahih al-Bukhari 3637), had water pour forth from his hands (Sahih al-Bukhari 3572), multiplied food (Sunan an-Nasai 3387), and did many other miracles. So, must we all be Muslim? In 1995, statues of Ganesh in India were said to have drunk milk offerings. So, should we all be Hindu? In Buddhist scripture, Buddha's birth is recorded as having been miraculous (Majjhima Nikaya, Acchariya-abbhuta Sutta). Should we all be Buddhist?
Rather than basing our lives on dubious miracle claims, so rife with fraud, it is wiser to base what we believe on clear statements of Scripture, which is the method that God has ordained as the normative way people are to come to faith in Him (Romans 10:14-17).