In the Ninth Article of the Creed, we profess our Faith in Unam, Sanctam, Catholicam et Apostolicam Ecclesiam. The CE tells us regarding the fourth mark, Apostolicity, "Apostolicity is the mark by which the Church of today is recognized as identical with the Church founded by Jesus Christ upon the Apostles. It is of great importance because it is the surest indication of the true Church of Christ, it is most easily examined, and it virtually contains the other three marks, namely, Unity, Sanctity, and Catholicity ..." If we believe there is One True Church outside of which there is no salvation, we do well. But we must identify that Church and remain with Her till the end, in order to obtain that salvation for ourselves and our loved ones. And the Saints and their Catechisms give us a simple means to do this.

1. St. Anthony Mary Claret has summarized it: "The fourth note or mark of the Church is to be Apostolic. That is to say, it was founded by the Apostles and is governed by their successors, the bishops, who. since the Apostles, have succeeded without interruption. And these bishops have a lawful mission to guard always, in their teaching and management of the Church, the unity of Faith and of communion with their head and center, the Roman Pontiff. All of us know that the Apostles fulfilled the mission that Jesus Christ gave them. And it is sufficient to read the list of the Catholic bishops, especially of the Supreme Pontiffs of Rome as the continuing Head or principal leader of Christianity ... in order to see that Pius IX, who by the mercy of God happily governs us, have succeeded Gregory XVI, and he Pius VIII. And so, ascending from one to the other, we shall arrive at Saint Peter, who was made by Jesus Christ the Prince of the Apostles and His Vicar on earth.

You will notice above that with the word mission I added the word lawful, that is, coming from that one who has the keys of the kingdom of heaven or of the Church, who is the Pope ... If, then, any heretics come to you, my son, saying that their churches are also Apostolic, there is nothing more to say to them than what Tertullian said: "Prove the origin of your churches. Make us see that the order of your bishops has in some way through succession descended from the beginning, that the first was any of the Apostles, or had as a predecessor some of the Apostolic men who had persevered together with the Apostles."

Inasmuch as the heretical sects will never be able to show this, so it is that none of them can reasonably glory in being Apostolic. But on the other hand, since the Catholic Church is the only one that is able to trace Her origin to the Apostles, it follows from what I have said that She alone is in all truth Apostolic." http://catholicvox.blogspot.com/2009/03/eens-saint-anthony-mary-claret-from.html

2. Similarly, Dom Prosper Gueranger, the great Traditional Liturgical Scholar praised by Pope Bl. Pius IX, writes this, "St. Leo the Great: ‘If our Lord willed that there should be something common to Peter and the rest of the princes of His Church, it was only on this condition, that whatsoever He gave to the rest, He gave it to them through Peter. Yes, the Episcopate is most Sacred, for it comes from the hands of Jesus Christ through Peter and his Successors. Such is the unanimous teaching of Catholic Tradition, which is in keeping with the language used by the Roman Pontiffs, from the earliest ages, who have always spoken of the Dignity of Bishops as consisting in their being "called to a share of their own solicitude" ... All Spiritual Authority comes from Peter; all comes from the Bishop of Rome, in whom Peter will continue to govern the Church to the end of time. Jesus Christ is the founder of the Episcopate; it is the Holy Ghost who establishes Bishops to rule the Church; but the Mission and the Institution, which assign the Pastor his flock, and the flock its Pastor, these are given by Jesus Christ and the Holy Ghost through the ministry of Peter and his Successors.

Thus it is that the divine Founder of the Church, who willed that she should be a city seated on a mountain, gave her visibility; it was an essential requisite; for since all were called to enter her pale, all must be able to see her. But He was not satisfied with this. He moreover willed that the spiritual power exercised by her pastors should come from a visible source, so that the faithful might have a sure means of verifying the claims of those who were to guide them in His name. Our Lord (we say it reverently) owed this to us; for, on the last day, He will not receive us as His children, unless we shall have been members of His Church, and have lived in union with Him by the ministry of pastors [or shepherds] lawfully constituted." https://reginamag.com/saint-peters-chair-at-antioch/

It is in this way that the Succession from St. Peter and the Apostles is continued in every age. The Pope gives a share in his authority when he appoints or confirms Bishops. In this way, Episcopal Authority derives from Papal Authority.

So, applying these rules today, it should be easy to find the Apostolic Church and Her visible Hierarchy, no? What does it profit us to know there is no salvation outside the Apostolic and Catholic Church, if we don't do what Fr. Gueranger says we should do? "Our Lord (we say it reverently) owed this to us; for, on the last day, He will not receive us as His children, unless we shall have been members of His Church, and have lived in union with Him by the ministry of pastors lawfully constituted." As God raised up St. Athanasius in ancient times and saintly Archbishop Lefebvre in our own times, He will raise up Pastors in the Episcopate who are Shepherds after His own Heart in His own Good Time. It is not for us lay Catholics, if we wish to do the Will of God, to say that there is no Hierarchy anymore.

The CE itself says, "In all theological works the same explanation of Apostolicity is found, based on the Scriptural and patristic testimony just cited. Billuart (III, 306) concludes his remarks on Apostolicity in the words of St. Jerome: "We must abide in that Church, which was founded by the Apostles, and endures to this day.: Mazella (De Relig. et Eccl., 359), after speaking of Apostolic succession as an uninterrupted substitution of persons in the place of the Apostles, insists upon the necessity of jurisdiction or authoritative transmission, thus excluding the hypothesis that a new mission could ever be originated by anyone in the place of the mission bestowed by Christ and transmitted in the manner described. Billot (De Eccl. Christi, I, 243-275) emphasizes the idea that the Church, which is Apostolic, must be presided over by bishops, who derive their ministry and their governing power from the Apostles. Apostolicity, then, is that Apostolic succession by which the Church of today is one with the Church of the Apostles in origin, doctrine, and mission. The history of the Catholic Church from St. Peter, the first Pontiff, to the present Head of the Church, is an evident proof of its Apostolicity..."

Do you believe that there is even today, an Apostolic and Catholic Church, with a Hierarchy, outside of which there is no salvation?