A few questions I have is this:
If you say that the history of Rome is fiction, WHY are non-Catholic Christians come into the Church each year?
Could it be that it is realizing the great prayer of Jesus as in John 17 that all Christian believers shall be ONE?
Because many of the so-called believers (as in I Cor.) are not really believers at all. That is, they have never understood the Gospel of Jesus Christ because they were more interested in religion, feeling better, community, or big organizations. None of these things are the Gospel. However, they are certainly attractions to Rome.
The Gospel begins with Christ choosing someone before the foundation of the world (Eph. 1). He then adopts the person and grants them faith. In doing so, He rescues them from their sins and begins to open their eyes to His work and His glory. Slowly (or sometimes more quickly), the person begins to recognize that all of this experience of salvation is actually the work of God...not themselves. The truths Paul wrote about in Eph. 2 come alive.
"For by grace you have been saved through faith, and that not of yourselves, it is the gift of God, not as a result of works, that no one should boast."
People all over the world are discovering this, but the numbers are not as impressive as those who join Islam or the RCC. Nevertheless, just as pagans outnumbered believers in Jesus during the first century (perhaps 10,000 to 1), believers in Jesus don't look at numbers. We look at truth. And the truth is in Him...not Rome. He can set one free from religion if He chooses. If that person is you, then what does it matter if 100,000,000 become Muslims or Catholics?