The problem with the Roman church is that it is entirely apostate, but this is another discussion altogether. Suffice to say, the big error in Rome that gives way to all other error is this idea of "apostolic succession" - they believe that the apostles, Peter in particular, was given an eternal office, to be occupied down throughout the generations. Therefore, "the teachings of the apostles" is not what was handed down to us by the original apostles, as contained within the New Testament, but rather, the New Testament
as well as whatever comes out of Rome. It's like one, giant, open canon of scripture. That is why they believe they are justified in teaching concepts that are absent from the Bible, such as the perpetual virginity of Mary, Mary as co-redeemer, praying to Mary and the Saints, the immaculate conception, the ascension of Mary, that Mary is the mother of God, the sacrifice of the Mass, purgatory, limbo, the Eucharist, confession to priests, praying the rosary, etc, etc. This whole mountain of doctrine all hinges on the idea of apostolic succession, which in turn, is defended by the following:
I also say to you that you are Peter, and upon this rock I will build My church; and the gates of Hades will not overpower it.
I will give you the keys of the kingdom of heaven; and whatever you bind on earth shall have been bound in heaven, and whatever you loose on earth shall have been loosed in heaven. Matthew 16:18-19
According to Catholics, this verse somehow establishes Peter as the rock upon which the entire church was built.
And they prayed and said, “You, Lord, who know the hearts of all men, show which one of these two You have chosen to occupy this ministry and apostleship from which Judas turned aside to go to his own place.” And they drew lots for them, and the lot fell to Matthias; and he was added to the eleven apostles. Acts 1:24-26
According to Catholics, the choosing of Matthias somehow establishes the idea that there is an office that needs be filled at all times. Peter, therefore, is no different. His office remains, and whoever occupies his office also possesses the keys of the kingdom, of binding on heaven and earth.
Here is the problem. Let's look at the context:
Now when Jesus came into the district of Caesarea Philippi, He was asking His disciples, “Who do people say that the Son of Man is?” And they said, “Some say John the Baptist; and others, Elijah; but still others, Jeremiah, or one of the prophets.” He said to them, “But who do you say that I am?” Simon Peter answered, “You are the Christ, the Son of the living God.” And Jesus said to him, “Blessed are you, Simon Barjona, because flesh and blood did not reveal this to you, but My Father who is in heaven. “I also say to you that you are Peter, and upon this rock I will build My church; and the gates of Hades will not overpower it. “I will give you the keys of the kingdom of heaven; and whatever you bind on earth shall have been bound in heaven, and whatever you loose on earth shall have been loosed in heaven.” Then He warned the disciples that they should tell no one that He was the Christ. Matthew 16:13-20
Here, Jesus is not saying that He would build the church upon Peter. Rather, the "Rock" upon which Christ would build His church was Peter's revelation of who Jesus Christ is. Regardless, I think there is enough ambiguity there to give me some serious pause before I would take such a giant leap in claiming such massive implications as the catholic church.
As for the passage in the first chapter of Acts, let's look at verses 16-21:
“Brethren, the Scripture had to be fulfilled, which the Holy Spirit foretold by the mouth of David concerning Judas, who became a guide to those who arrested Jesus. “For he was counted among us and received his share in this ministry.” (Now this man acquired a field with the price of his wickedness, and falling headlong, he burst open in the middle and all his intestines gushed out. And it became known to all who were living in Jerusalem; so that in their own language that field was called Hakeldama, that is, Field of Blood.)
“For it is written in the book of Psalms,
‘LET HIS HOMESTEAD BE MADE DESOLATE,
AND LET NO ONE DWELL IN IT’;
and,
‘LET ANOTHER MAN TAKE HIS OFFICE.’
“Therefore it is necessary that of the men who have accompanied us all the time that the Lord Jesus went in and out among us -"
Peter was consciously fulfilling prophecy. Judas' office was to be taken by another not because of apostolic succession, but as a testimony against Judas - his homestead is desolate. And rather than declaring the need for an ongoing office, Peter was demonstrating the need to be mindful of God's Word.
It's all about the Word of God. It's not about the traditions of men.
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As for reformed theology, really think about this:
Joe and John both hear the Gospel. Joe is hostile to the message, rejecting it outright. Having rejected Jesus Christ, Joe goes to hell. John hears the same message Joe heard, but he receives it with joy. And persevering in the faith, John goes on to Life Eternal.
Was John better than Joe? Did John merely
choose to have faith? And if so, why did not Joe choose to choose faith? People do not just choose for no reason. There has to be an
inclination towards one choice or the other.
If God bestows the same amount of grace upon both Joe and John, yet John accepts while Joe rejects, is not the saving difference something that is inherent in John? Really ponder that.
When we read the Bible, we see it is clear that John accepted because John was given faith by God, drawn by the Father, being chosen by God. It had nothing to do with anything inside of John that was inherent to John.
John 6:44 Ephesians 1:5 Romans 8:29 Acts 13:48
But it doesn't stop at salvation. The Bible teaches us that we must persevere in faith. This, too, is God's doing!
John 10:29 Jude 1:24 Philippians 1:6
The fact of the matter is that we are ALL totally depraved, gone astray, and incapable of seeking after God. If any, and I mean ANY, part of salvation is contingent upon ourselves, we are without hope. Whether it is to believe
correctly, respond
correctly, persevere
correctly, or do anything else
correctly, if it falls upon us ourselves to contribute so much as a single ounce of ourselves to it, we can do nothing but bungle it.
Indeed, if there is any difference between those of us who will end up in heaven and those who end up in hell, this difference is in no way inherent to us. It can't be! That is what makes it grace. We can do
nothing to save ourselves - all of salvation, all of it, every last bit of it - it is GOD'S doing. And this is precisely why we must have boldness that He who began a good work in us will carry it on until completion. And for all eternity, we will not be thanking ourselves that we believed. We will not be thinking, "Phew, I'm glad I believed." Rather, we will be thanking God that He chose us, of all people, and saved us out of the world. To God and God alone, most sovereign Lord of all that is good and right and true, be all the credit and all the praise and all the glory forever and ever.