“The church” spoken of in the Bible is not the Roman Catholic Church.
And no, much of what Jesus said wasn’t written down. But we can be assured that there is a completeness to what the Holy Spirit chose to be included.
On the interpretation claim, the Catholic Church can tell me that the Genesis Creation and evolution over millions and billions of years go together, but I’m not gooing to believe that.
On “the Eucharist,” it’s made me wonder why call it that? It’s very religious, formal, pretentious, even worse than regularly calling family “my spouse,” or “my offspring,” and the whole Catholic Church and service is like that.
Eucharist means thanksgiving.
So you arrogate to yourself the “authority” to interpret Scripture? Like Rev. Al Sharpton? Interesting, is it not it that the all the great theologians according to lights from St. Thomas Aquinas, Augustine, and Benedict XVI (whom Time magazine called the “theological Einstein of our times”) are all fools? (I assume you haven’t read any of their books) .The great Anglican theological (now Cardinal Newman) converted to Catholicism, as did the Chief Rabbi of Rome, to say nothing of Richard Neuhaus who was America’s preeminent Lutheran theologian.
The curse and evil of Protestantism is best described in Hillaire Belloc’s book “Heresies” where he says that unlike other heretical beliefs, Protestantism spawned a “cluster of heresies.”