Your statement is based on the premise that the Catholic Church is the same church Paul was talking about. **So please tell me what Church or Religious group that St Paul was talking to? Name this religion or Church that has had the fullness truth all these years, which religion or church is Christ’s Church, the pillar and foundation of truth as found in 1 Timothy? ** Those same Scriptures are clear about what the church is, This is obviously clear to you as to what Sacred Scriptures say, but as for me, I am failing to see what the obvious is to you. I do not have your gift of interpretation, so please tell me whom St Paul was addressing. What was the Church that Christ established to be the pillar and foundation of truth? Please tell me what Church did Christ promised that the gates of hell would not prevail against it? ** and it is not a religious institution operated from the city of Rome. ** This statement leads me to believe that you do not consider the Catholic Church and Faith as a valid religion, is this the case? So, tell me what religion/denomination do you practice? Is there just one Church on main street somewhere, USA, or is it like the Lutheran Church (sorry not picking on the Lutherans) where they are all over the world? However, for the record, Vatican City is the “Headquarters” so to speak of the Catholic Faith, Latin Rite, not the city of Rome. The Vatican is a sovereignty onto its self, it is not a part of Rome or the country of Italy. The church consists of those in every place that are adopted by God to be His children through Christ.
As you look back in time you see a church that has existed since the time of Christ, but if you view that history from a doctrinal point of view you will see numerous adoptions of false doctrine by the very leadership you trust to teach you truth. Since it seems that you like the historical context here, can you produce a list of Christian religions/denominations starting with the Church Christ established to present day.
Paul said,
“The church of the living God, the pillar and ground of the truth.”
And Irenaeus said,
“The pillar and ground of the Church is the Gospel and the spirit of life.” (Against Heresies, 3:11:8)