Christ promised the gates of Hell would never prevail over the Church. And the Catholic Church goes on, holding fast to the doctrine it received from the Apostles.
I’m not worried; the weak seed is being winnowed out.
One what basis do you judge "holding fast" by, professions or practice? Yea, a man may say, Thou hast faith, and I have works: shew me thy faith without thy works, and I will shew thee my faith by my works. (James 2:18)
And what is the basis for your assurance that Rome is holding fast to the doctrine it received from the Apostles? The weight of Scripture or the statements of your church that she is doing so?