Continuity before during and after the canon of Holy Scripture.
We can read St. Paul, Justin Martyr and see the same Church same catholic (universal) belief. And follow this without break up today.
If the argument is the Church went wrong, as in the Mormon assertion, then precisely where? St. Paul? The catacombs? Nicea? And where then was the Church, the One Bread, One Faith, One Church for 1600 years?
And what then of Christ’s promise for the continuance of His Church.
Without internal self-contradiction it is impossible to proclaim what has become the multiple faiths of the Reformation is the same as the Church in Scripture or afterward.
Scripture, history or both must be twisted to prop up their view.