The true Church...

11. The true Church of Christ must be one in unity and doctrine:

First, it cannot be that the true Church is divided of belief in opinion, as God would no longer be its author. God, a God of Truth, could not possibly have revealed a plurality of religions, or a multitude of varying Christianities. Our Lord taught one religion and founded one Church, not multiple ones. The Protestant denominations clearly fall into this category with their thousands of denominations, all with beliefs opposing the other. How can we call thousands of opposing denominations a reformation of the Church? Our Lord's threat of damnation for not believing clearly condemns the opposing Protestant denominations that have formed since the Protestant reformation.
Consider the verse, "And Jesus knowing their thoughts, said to them: Every kingdom divided against itself shall be made desolate: and every city or house divided against itself shall not stand." Matthew 12:25. Are not Protestant denominations divided among themselves with little hope to reunite?
Consider the verse, "And let the peace of Christ rejoice in your hearts, wherein also you are called in one body: and be ye thankful." Colossians 3:15. One body is one Church, and cannot possibly be thousands of opposing denominations.
When the Protestant reformers brought forward the belief that each was to interpret Scripture on his own, that made each person on earth equivalent to the next. Under this belief a lay person is equivalent to a priest or minister, therefore it is optional for a lay person to consult them. This situation inevitably leads to conflicts between all of these "equal" people claiming their interpretation is correct, which inevitably leads to different denominations which inevitably leads to multiple doctrines. As already mentioned above, nowhere is it found in Scripture that we are to interpret Scripture on our own, rather Scripture does clearly indicate Our Lord instructed His Apostles to, "Go ye into the whole world, and preach the gospel to every creature. He that believeth and is baptized, shall be saved: but he that believeth not shall be condemned." Matthew 16:15. Clearly we must believe in one religion as taught by the Apostolic successors to be saved, not to believe two unknowns like Luther or Calvin, or any other number of reformers claiming different doctrines.
Looking at all the Catholic Church has been through with respect to heresies and persecution, the same faith remains in Catholics century to century. Looking at any random point in the history of the Catholic Church, if there was ever a difference in opinion relating to faith or morals, a General Council or the Roman See, guided by the Holy Ghost, has always determined what the correct belief should be, and you will see every Catholic has always submitted to their decisions and argued no more. The Protestant denominations do not have this structure, and therefore they will forever be in disagreement and will forever have multiple doctrines. Can one really call this introduction of contradicting doctrines a reformation of the Church? This is not the teaching of Our Lord.
The Protestant reformers such as Luther and Calvin did not even agree on the same canon of Scriptures from the start of the Reformation. They also differ in opinion on things such as number of Sacraments and other beliefs. For example, Protestant denominations are as much divided among themselves regarding Justification than they are divided with the Catholic Church, with no hope of ever coming to an agreement. Scripture cannot be their judge because it is concerning Scripture that they are in disagreement. From the start of the Reformation this was clearly a red flag that this so-called reformation of the Church was not sent from God, as why would God suddenly decide to spin off multiple denominations with opposing doctrines? Why didn't Jesus teach, approve or ever hint of such a thing?
Those who have a diversity of canon, that are divided into thousands of opposing denominations with different beliefs, cannot "add up" to one true Church, and neither can they be called by the name of "Church" like the Catholic Church can who has one same head, the same canon of the Scriptures, and one like rule for interpreting them. "He that is not with me, is against me" Matthew 12:30.
It is very common these days to get a variety of answers when asking Protestants if their denomination holds the truth over other Protestant denominations. We've heard some Protestants claim "Our denomination is not 100% correct". If not, then we ask why are you a part of that denomination? If your denomination is not the true Church as Christ gave to us, which denomination IS the true Church, the pillar of truth? We know it must exist somewhere because Christ promised us it would always exist.
We have also heard some Protestants claim that it is not for them to place judgment on the correctness of any denomination. We ask, why not? Our Lord clearly laid out what the truth is and how we are to be saved, why are you now unsure about it, and most of all why are you indifferent about it? Here we present two points against these illogical claims:

1) For one to claim they are a Lutheran or Presbyterian or some other Protestant, but yet be indifferent and not claim their religion is the true or correct religion is absurdity. How can one be indifferent in what they believe? This is the same as believing truth and error are both acceptable. Are mathematicians indifferent in the outcome of their equations? Are scientists indifferent in their studies? If they were, they would not have the respect of their peers and would not be mathematicians or scientists. Where would we be if every scientist or mathematician or doctor were to be indifferent in their work and always produce uncertain results generation to generation? What you believe in must be the truth from your perspective or you cannot claim you believe in it. The fact of the matter is, if no one is an authority and if everyone is open to their own interpretation of Scripture, this inevitably leads to indifferentism, for who knows who is right! Nowhere else in the world will you see the concept of indifferentism accepted as we see with Protestant denominations. It is just as wrong to deny the faith than it is to be indifferent about searching for it!

2) If one Protestant denomination believes in the real presence in the Holy Eucharist, and another believes it to be a symbol only, these are directly opposing views and only one can be the truth. If the Symbolic point of view were true, then the believers in the real presence would be guilty of idolatry among other things and if the real presence is true, the symbolic believer would be following a false religion. How can Protestants be indifferent about denominations when critical beliefs such as this separate them? How could Protestants be neutral on a belief that would decide whether we are saved or damned? Only one belief is true according to Our Lord. To say one religion is as good as another when such massive differences exist between each of them is to say truth and error are acceptable to Our Lord, which is simply absurd. Our Lord never taught multiple doctrines!