How can we trust that the gates of hell will never prevail against the Church, when this isn’t even an infallible teaching of the Church?
According to the famous Ott’s Fundamentals of Catholic Dogma
The Church is indefectible, that is, she remains and will remain the Institution of Salvation, founded by Christ, until the end of the world. (Sent. certa.)
This teaching is “Sent. certa”. This means it can be assured to be true, but it isn’t infallible. So this means there is a very small chance that it isn’t true.
So basically the Church is stating that it isn’t infallibly certain that the gates of hell will never prevail against the church. If there is even a slight possibility that the gates can prevail, then we have to begin to question if the gates will prevail? Did the gates already prevail? Are they about to prevail?