Subsists and a degradation of doctrine.

Who is and isn't a Catholic according to Saint Robert Bellarmine:

       “This one and true Church is the assembly of men bound together by the profession of the same Christian faith and the communion of the same sacraments, under the rule of the legitimate pastors, and especially that of the Roman Pontiff, the one Vicar of Christ on earth. From this definition, it is easy to infer which men belong to the Church and which do not belong to it. 

The Roman Catechism on The Catholic Church

First Part Of This Article : "I Believe In The Holy Catholic Church

The Latins, having borrowed the word ecclesia (church) from the Greeks, have transferred it, since the preaching of the Gospel, to sacred things. It becomes necessary, therefore, to explain its meaning.

"Church"

The word ecclesia (church) means a calling forth. But writers afterward used it to signify a meeting or assembly, whether the people gathered together were members of a true or of a false religion. Thus in the Acts it is written of the people of Ephesus that when the town­clerk had appeased a tumultuous assemblage he said: And if you inquire after any other matter, it may be decided in a lawful church. The Ephesians, who were worshippers of Diana, are thus called a lawful church (ecclesia). Nor are the Gentiles only, who knew not God, called a church (ecclesia); by the same name at times are also designated the councils of wicked and impious men. I have hated the church (ecclesiam) of the malignant, says the Prophet, and with the wicked I will not sit.
In common Scripture usage, however, the word was subsequently employed to signify the Christian society only, and the assemblies of the faithful; that is, of those who are called by faith to the light of truth and the knowledge of God, that, having forsaken the darkness of ignorance and error, they may worship the living and true God piously and holily, and serve Him from their whole heart. In a word, The Church, says St. Augustine, consists of the faithful dispersed throughout the world.'

Mysteries Which The Word Church Comprises

In this word are contained important mysteries. For, in the calling forth, which it signifies, we recognise at once the benignity and splendour of divine grace, and we understand that the Church is very unlike all other societies. Other bodies rest on human reason and prudence, but the Church reposes on the wisdom and counsels of God who has called us inwardly by the inspiration of the Holy Ghost, who opens the hearts of men; and outwardly, through the labor and ministry of pastors and preachers.

Moreover, the end of this vocation, that is, the knowledge and possession of things eternal will be at once understood if we but remember why the faithful of the Old Law were called a Synagogue, that is, a flock for, as St. Augustine teaches, they were so called, because, like cattle, which are wont to herd together. they looked only to terrestrial and transitory goods. Wherefore, the Christian people are justly called, not a Synagogue, but a Church, because, despising earthly and passing things, they pursue only things heavenly and eternal.

Other Names Given The Church In Scripture

Many names, moreover, which are replete with mysteries, have been used to designate the Christian body. Thus, by the Apostle, it is called the house and edifice of God. If, says he to Timothy, I tarry long, that thou mayest know how thou oughtest to behave thyself in the house of God, which is the church of the living God, the pillar and ground of truth. The Church is called a house, because it is, as it were, one family governed by one father of the family, and enjoying a community of all spiritual goods.

It is also called the flock of the sheep of Christ, of which He is the door and the shepherd. It is called the spouse of Christ. I have espoused you to one husband, says the Apostle to the Corinthians, that I may present you as a chaste virgin to Christ; and to the Ephesians: Husbands love your wives, as Christ also loved the church; and of marriage: This is a great sacrament, but I speak in Christ and in the church.

Finally, the Church is called the body of Christ, as may be seen in the Epistles to the Ephesians and Colossians. Each of these appellations has very great influence in exciting the faithful to prove themselves worthy of the boundless clemency and goodness of God, who chose them to be the people of God.

The Parts of the Church

These things having been explained, it will be necessary to enumerate the several component parts of the Church, and to point out their difference, in order that the faithful may the better comprehend the nature, properties, gifts, and graces of God's beloved Church, and by reason of them unceasingly praise the most holy name of God.

The Church consists principally of two parts, the one called the Church triumphant; the other, the Church militant. The Church triumphant is that most glorious and happy assemblage of blessed spirits, and of those who have triumphed over the world, the flesh, and the iniquity of Satan, and are now exempt and safe from the troubles of this life and enjoy everlasting bliss. The Church militant is the society of all the faithful still dwelling on earth. It is called militant, because it wages eternal war with those implacable enemies, the world, the flesh and the devil.  (Nah, it doesn't do that anymore because that is mean and divisive).

We are not, however, to infer that there are two Churches. The Church triumphant and the Church militant are two constituent parts of one Church; one part going before, and now in the possession of its heavenly country; the other, following every day, until at length, united with our Saviour, it shall repose in endless felicity.

The Members Of The Church Militant

The Church militant is composed of two classes of persons, the good and the bad, both professing the same faith and partaking of the same Sacraments, yet differing in their manner of life and morality.
The good are those who are linked together not only by the profession of the same faith, and the participation of the same Sacraments, but also by the spirit of grace and the bond of charity. Of these St. Paul says: The Lord knoweth who are his. Who they are that compose this class we also may remotely conjecture, but we can by no means pronounce with certainty. Hence Christ the Saviour does not speak of this portion of His Church when He refers us to the Church and commands us to hear and to obey her. As this part of the Church is unknown, how could we ascertain with certainty whose decision to recur to, whose authority to obey?

The Church, therefore, as the Scriptures and the writings of the Saints testify, includes within her fold the good and the bad; and it was in this sense that St. Paul spoke of one body and one spirit. Thus understood, the Church is known and is compared to a city built on a mountain, and visible from every side. As all must yield obedience to her authority, it is necessary that she may­be known by all.

That the Church is composed of the good and the bad we learn from many parables contained in the Gospel. Thus, the kingdom of heaven, that is, the Church militant, is compared to a net cast into the sea, to a field in which tares were sown with the good grain, to a threshing floor on which the grain is mixed up with the chaff, and also to ten virgins, some of whom were wise, and some foolish. And long before, we trace a figure and resemblance of this Church in the ark of Noah, which contained not only clean, but also unclean animals.

But although the Catholic faith uniformly and truly teaches that the good and the bad belong to the Church, yet the same faith declares that the condition of both is very different. The wicked are contained in the Church, as the chaff is mingled with the grain on the threshing floor, or as dead members sometimes remain attached to a living body.

Those Who Are Not Members Of The Church

Hence there are but three classes of persons excluded from the Church's pale: infidels, heretics and schismatics, and excommunicated persons. 

Infidels are outside the Church because they never belonged to, and never knew the Church, and were never made partakers of any of her Sacraments. 

Heretics and schismatics are excluded from the Church, because they have separated from her and belong to her only as deserters belong to the army from which they have deserted. It is not, however, to be denied that they are still subject to the jurisdiction of the Church, inasmuch as they may be called before her tribunals, punished and anathematised. 

Finally, excommunicated persons are not members of the Church, because they have been cut off by her sentence from the number of her children and belong not to her communion until they repent. 

But with regard to the rest, however wicked and evil they may be, it is certain that they still belong to the Church: Of this the faithful are frequently to be reminded, in order to be convinced that, were even the lives of her ministers debased by crime, they are still within the Church, and therefore lose nothing of their power.



The Baltimore Catechism on the church

Q. 489. What is the Church?


A. The Church is the congregation of all those who profess the faith of Christ, partake of the same Sacraments, and are governed by their lawful pastors under one visible Head.


Mystici Corporis:

14. That the Church is a body is frequently asserted in the Sacred Scriptures. "Christ," says the Apostle, "is the Head of the Body of the Church."[13] If the Church is a body, it must be an unbroken unity, according to those words of Paul: "Though many we are one body in Christ."[14] But it is not enough that the Body of the Church should be an unbroken unity; it must also be something definite and perceptible to the senses as Our predecessor of happy memory, Leo XIII, in his Encyclical Satis Cognitum asserts: "the Church is visible because she is a body.[15] Hence they err in a matter of divine truth, who imagine the Church to be invisible, intangible, a something merely "pneumatological" as they say, by which many Christian communities, though they differ from each other in their profession of faith, are untied by an invisible bond.

15. But a body calls also for a multiplicity of members, which are linked together in such a way as to help one another. And as in the body when one member suffers, all the other members share its pain, and the healthy members come to the assistance of the ailing, so in the Church the individual members do not live for themselves alone, but also help their fellows, and all work in mutual collaboration for the common comfort and for the more perfect building up of the whole Body.

16. Again, as in nature a body is not formed by any haphazard grouping of members but must be constituted of organs, that is of members, that have not the same function and are arranged in due order; so for this reason above all the Church is called a body, that it is constituted by the coalescence of structurally untied parts, and that it has a variety of members reciprocally dependent. It is thus the Apostle describes the Church when he writes: "As in one body we have many members, but all the members have not the same office: so we being many are one body in Christ, and everyone members one of another." [16]

17. One must not think, however, that this ordered or "organic" structure of the body of the Church contains only hierarchical elements and with them is complete; or, as an opposite opinion holds, that it is composed only of those who enjoy charismatic gifts - though members gifted with miraculous powers will never be lacking in the Church. That those who exercise sacred power in this Body are its chief members must be maintained uncompromisingly. It is through them, by commission of the Divine Redeemer Himself, that Christ's apostolate as Teacher, King and Priest is to endure. At the same time, when the Fathers of the Church sing the praises of this Mystical Body of Christ, with its ministries, its variety of ranks, its officers, it conditions, its orders, its duties, they are thinking not only of those who have received Holy Orders, but of all those too, who, following the evangelical counsels, pass their lives either actively among men, or hidden in the silence of the cloister, or who aim at combining the active and contemplative life according to their Institute; as also of those who, though living in the world, consecrate themselves wholeheartedly to spiritual or corporal works of mercy, and of those in the state of holy matrimony. Indeed, let this be clearly understood, especially in our days, fathers and mothers of families, those who are godparents through Baptism, and in particular those members of the laity who collaborate with the ecclesiastical hierarchy in spreading the Kingdom of the Divine Redeemer occupy an honorable, if often a lowly, place in the Christian community, and even they under the impulse of God and with His help, can reach the heights of supreme holiness, which, Jesus Christ has promised, will never be wanting to the Church.

18. Now we see that the human body is given the proper means to provide for its own life, health and growth, and for that of all its members. Similarly, the Savior of mankind out of His infinite goodness has provided in a wonderful way for His Mystical Body, endowing it with the Sacraments, so that, as though by an uninterrupted series of graces, its members should be sustained from birth to death, and that generous provision might be made for the social needs of the Church. Through the waters of Baptism those who are born into this world dead in sin are not only born again and made members of the Church, but being stamped with a spiritual seal they become able and fit to receive the other Sacraments. By the chrism of Confirmation, the faithful are given added strength to protect and defend the Church, their Mother, and the faith she has given them. In the Sacrament of Penance a saving medicine is offered for the members of the Church who have fallen into sin, not only to provide for their own health, but to remove from other members of the Mystical Body all danger of contagion, or rather to afford them an incentive to virtue, and the example of a virtuous act.

19. Nor is that all; for in the Holy Eucharist the faithful are nourished and strengthened at the same banquet and by a divine, ineffable bond are united with each other and with the Divine Head of the whole Body. Finally, like a devoted mother, the Church is at the bedside of those who are sick unto death; and if it be not always God's will that by the holy anointing she restore health to the mortal body, nevertheless she administers spiritual medicine to the wounded soul and sends new citizens to heaven - to be her new advocates - who will enjoy forever the happiness of God.

20. For the social needs of the Church Christ has provided in a particular way by the institution of two other Sacraments. Through Matrimony, in which the contracting parties are ministers of grace to each other, provision is made for the external and duly regulated increase of Christian society, and, what is of greater importance, for the correct religious education of the children, without which this Mystical Body would be in grave danger. Through Holy Orders men are set aside and consecrated to God, to offer the Sacrifice of the Eucharistic Victim, to nourish the flock of the faithful with the Bread of Angels and the food of doctrine, to guide them in the way of God's commandments and counsels and to strengthen them with all other supernatural helps.

21. In this connection it must be borne in mind that, as God at the beginning of time endowed man's body with most ample power to subject all creatures to himself, and to increase and multiply and fill the earth, so at the beginning of the Christian era, He supplied the Church with the means necessary to overcome the countless dangers and to fill not only the whole world but the realms of heaven as well.

22. Actually only those are to be included as members of the Church who have been baptized and profess the true faith, and who have not been so unfortunate as to separate themselves from the unity of the Body, or been excluded by legitimate authority for grave faults committed. "For in one spirit" says the Apostle, "were we all baptized into one Body, whether Jews or Gentiles, whether bond or free."[17] As therefore in the true Christian community there is only one Body, one Spirit, one Lord, and one Baptism, so there can be only one faith.[18] And therefore, if a man refuse to hear the Church, let him be considered - so the Lord commands - as a heathen and a publican. [19] It follows that those who are divided in faith or government cannot be living in the unity of such a Body, nor can they be living the life of its one Divine Spirit.

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Well, that seems quite definitive and understandable - especially take note of the bolded red, those outside the Church can not be said to be living the life of its one Divine Spirit - and all was well with this essential definition until the revolutionaries (devotees of the New Theology) came along and effected a revolution within the form of Catholicism during and after Vatican Two.

Thus, Lumen Gentium teaches:

This is the one Church of Christ which in the Creed is professed as one, holy, catholic and apostolic, (12*) which our Saviour, after His Resurrection, commissioned Peter to shepherd,(74) and him and the other apostles to extend and direct with authority,(75) which He erected for all ages as "the pillar and mainstay of the truth".(76) This Church constituted and organized in the world as a society, subsists in the Catholic Church, which is governed by the successor of Peter and by the Bishops in communion with him,(13*) although many elements of sanctification and of truth are found outside of its visible structure. These elements, as gifts belonging to the Church of Christ, are forces impelling toward catholic unity.

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This new supposed definition is not an example of the development of doctrine but, rather, an example of the degradation of doctrine.

Where did the degradation come from and why did the Council refuse to teach what has always been taught about the Catholic Church when it comes to who is and isn't a member of it?

This scholar has the answer to the question as to why the Council did not teach that The Catholic Church IS the Body of Christ but, rather, substituted subsists for is:

What sensible Catholic men can read this and not respond that such a definition is not a development of doctrine but a degradation of doctrine that has led to massive confusion?

The ONE Church could also subsist elsewhere?

The Anglicans would not be required to accept Catholic Doctrine before converting?

Well, that is complete and utter bull shit heresy, plain and simple.