One of the handicaps of a fundamentalist mindset is that the reader believes their interpretation is what is written. One cannot get one’s mind around the possibility that it could be interpreted differently.
I miss the old forum rules. It used to be that non-Catholics were expected to respect our belief/faith, even if they disagree with the doctrine. That seems to have been lost in the sauce.
Reformed Christians are well versed and "drilled’ as it were, in an anti-Catholic perspective.
There is only One Body.
There is no Church that began in Rome. The Church founded by Christ began in Palestine. Christians that travelled to Rome and formed the first community there were likely those who were at Pentecost in Jerusalem.
Paul writes to the Corinthians about how, when they have sex with a prostitute, the “two shall become one”, and the perpetrator has then joined the prostitute with the Body of Christ.
15 Do you not know that your bodies are members of Christ? Shall I therefore take the members of Christ and make them members of a prostitute? Never! 16 Do you not know that he who joins himself to a prostitute becomes one body with her? For, as it is written, “The two shall become one flesh.” 1 Corinthians 6:15–16
So we can see that which is unholy can be joined to the Body through the sinful actions of members of the body. Would you say that the member of the Body who had sex with a prostitute was “fully in Christ”?