That's a lot of theory and explanation over a few words in scripture. I wonder why the bible wasn't a bit more explanatory since it's author would have seen the utter confusion ahead. Ah well---must be a minor point.
This is a very JW-type viewpoint. It is also very representative of an American viewpoint on Christianity, since American Christianity has contained strong strains of fundamentalist approaches to Scripture (which led to JWism). What you've said might be a problem for "Bible only" fundamentalists (a claim JWs also make for themselves), but for hundreds of millions of Christians, the Bible isn't a complete compendium defining the Christian faith. It isn't the only source of knowledge or truth about the Christian faith. It is a collection of writings addressing specific things at different places during different times. Before a canon of Scripture was defined, Christians had been living as a community for hundreds of years. The Christian church did not come from the Bible. The Bible came from the church.
...the church of the living God, the pillar and ground of the truth.
I do not believe the Christian faith is a "religion of the book." Christianity is a religion of the Word of God. The Word is not a written, mute, word in a book. It is one that is alive...and the church is also alive in communion with the Word.
But the Paraclete, the Holy Ghost, whom the Father will send in my name, he will teach you all things, and bring all things to your mind, whatsoever I shall have said to you.