[Grig]

"Since the gospel (i.e. God's revelation regarding THE WAY of our entry into the His Kingdom) was established, at least, by the time of Paul's writing, some 1900+ years ago, as unchanging per Galatians 1:8,9 ... what revelation does Joseph bring to this dispensation which is, somehow, necessary to the question of our salvation ?"

The gospel is unchanging, true, but man's understanding of it has evolved away from the truth, and the authority of God was lost. A prophet was required to restore the fullness of the gospel and the authority. There was much knowledge that had to be restored, and what little of it you already know of you clearly reject. If you want to konw more, search on 'restoration' on lds.org

[Quester]

The gospel is unchanging, true, but man's understanding of it has evolved away from the truth, and the authority of God was lost. A prophet was required to restore the fullness of the gospel and the authority. There was much knowledge that had to be restored, and what little of it you already know of you clearly reject.

This is, once again, merely a claim of the LDS church. What is the evidence for such a claim?

And, for the record, I do not reject the teaching of the LDS church.

It would be much more accurate to say, that, as of this point in time, ... I am simply unpersuaded.

At this point in time, I would say that the evidence the LDS church has presented to back up it's claims ... has simply been unpersuasive.