@tgGodsway
The Catholic Church is the apostolic Church. One Holy Apostolic Catholic Church. You can say she started at Pentecost in that upper room, not in Rome. They were all there, in Jerusalem.
Here is a testimony by a Protestant Historian who converted to Catholic. - A. David Anders, Ph.D.
The Protestant Reformers had justified their revolt by an appeal to “Scripture alone.” My studies in the doctrine of justification had shown me Scripture was not as clear a guide as the Reformers alleged. What if their whole appeal to Scripture was misguided? Why, after all, did I treat Scripture as the final authority?
When I posed this question to myself, I recognized that I had no good answer. The real reason I appealed to Scripture alone was that this is what I had been taught. As I studied the issue, I discovered that no Protestant has ever given a satisfactory answer to this question. The Reformers did not really defend the doctrine of “Scripture alone.” They merely asserted it. Even worse, I learned that modern Protestant theologians who have tried to defend “Scripture alone” do so by an appeal to tradition. This struck me as illogical. Eventually, I realized that “Scripture alone” is not even in Scripture. The doctrine is self-refuting. I also saw that the earliest Christians knew no more of “Scripture alone,” than they had known of “faith alone.” On the issues of how-we-are-saved and how-we-define-the-faith, the earliest Christians found their center in The Church. The Church was both the authority on Christian doctrine as well as the instrument of salvation.
By the time I finished my Ph.D., I had completely revised my understanding of the Catholic Church. I saw that her sacramental doctrine, her view of salvation, her veneration of Mary and the saints, and her claims to authority were all grounded in Scripture, in the oldest traditions, and in the plain teaching of Christ and the Apostles. I also realized that Protestantism was a confused mass of inconsistencies and tortured logic. Not only was Protestant doctrine untrue, but it bred contention, and could not even remain unchanged. The more I studied, the more I realized that my Evangelical heritage had moved far not only from ancient Christianity, but even from the teaching of her own Protestant founders.