All singular events. Only the Catholic Church was promised to lead the Body of Christ to all Truth until the end of the world. As in, ongoing.
Please show the scripture that says that its that institution that was to lead.
Absolutely, dead wrong.
Jesus never promised that the church would lead into all truth, but that the Holy Spirit would lead into all truth.
John 16:13 When the Spirit of truth comes, he will guide you into all the truth, for he will not speak on his own authority, but whatever he hears he will speak, and he will declare to you the things that are to come.