“Or, it may be that the roman church is the harlot of revelation 17.”
“If the roman church is judged by its works, it most certainly qualifies as the church that preached a false gospel of salvation.”
The Church does not teach a false gospel. Protestant sects do.
Search the scriptures, for in them you think you have life and they speak of Jesus Christ. That includes the prophecy and doctrine and reproof and correction and righteousness that God teaches, not the pope.