Are you saying there is "no such thing" as blue-duncan's church?
Yes, I do. I believe we already discussed this on this thread. It is of course fine to call Protestant communities "church" in casual talk or in reference to the physical plant, and then it should not be capitalized. Even though Blue Duncan did not capitalize his "church", his meaning was that his community made a dogmatic determination from scripture and guided by the Holy Ghost, contrary to the one held by the Catholic Church and regarding the Purgatory. He therefore meant his "church" as a source of doctrine, and he does not have a Church in that sense.
Why? Because, although the original meaning of ecclesia is merely community, in Christian usage it came to designate a specific apostolic institution whose authority descends from Christ and His apostles in a visible and concrete way. One cannot do a bible study, come up with some conclusions from it and call it Church, -- apostolic succession is needed.
As the Father hath sent me, I also send you.(John 20:21)how shall they preach unless they be sent (Romans 10:15)
let the unction, which you have received from him, abide in you. And you have no need that any man teach you; but as his unction teacheth you of all things, and is truth, and is no lie. And as it hath taught you, abide in him. (1 John 2:27)