It is a common Protestant tactic to arbitrarily choose a time period (the first two centuries) and then claim that there isn’t evidence of some Catholic doctrine during that time period (the papacy). I’ve found that the most effective response comes in two parts:
- demonstrate that they believe matters of faith that are found after that same time period; and
- demonstrate that there is more evidence in that time period for the Catholic doctrine than their own.
For #1, take the canon of the New Testament. Nearly all Protestant denominations believe that 27 books make up the New Testament Canon. Where in recorded history do we find for the first time that the Christian Church decides that these 27 books are in fact scriptural?
The earliest possible date is the canon as contained in a letter from St. Athanasius in 367. Agreement by the western Church as a whole actually came in the Council of Rome and the Council of Hippo in the fifth century. You don’t need to provide that though. Just ask them to show you an early writing setting forth the undisputed canon of the New Testament. You, on the other hand, if you search, can find several church fathers from the fourth century disputing whether certain books (Hebrews, Revelation, etc.) are canonical.
On to #2, the pope. Here is Tertullian (ca. 220):
I hear that there has even been an edict set forth, and a peremptory one too [by the bishop of Rome]. The Pontifex Maximus—that is, the bishop of bishops—issues an edict: “I remit, to such as have discharged (the requirements of) repentance, the sins both of adultery and of fornication.” (1)
. . .
If, because the Lord has said to Peter, Upon this rock will I build My Church, to you have I given the keys of the heavenly kingdom; or, Whatsoever you shall have bound or loosed in earth, shall be bound or loosed in the heavens, you therefore presume that the power of binding and loosing has derived to you, that is, to every Church akin to Peter, what sort of man are you, subverting and wholly changing the manifest intention of the Lord, conferring (as that intention did) this (gift) personally upon Peter?
newadvent.org/fathers/0407.htm Tertullian, On Modesty, Chapter 21.
Tertullian disagreed with Pope Callixtus I unilaterally granting forgiveness to repentant adulterers and fornicators into the Church. Of course, Tertullian was a heretic at this time, following the private revelation of Montanus and his followers. The point is, in ca. 220 Callixtus unilaterally exercised authority in the name of St. Peter and under the title Pontifex Maximus.
Depending on which source you consult, the term “pope” was being used by the Bishop of Rome as early as 304.
en.wikipedia.org/wiki/Pope#History_2
The title “pope” was used by the bishop of Rome in the fourth century. In the early third century Callixtus claimed the authority of St. Peter, unilaterally exercised it, and apparently was being called Pontifex Maximus. All of this happened as a matter of historical record before agreement upon the New Testament Canon.