“All appeals to Scripture are appeals to interpretations of Scripture.The only real question is: whose interpretation?”
This seems self-evident to me. I do not see the problem.
I believe salvation is granted to individuals by hearing and believing the gospel message.
The final authority over the meaning of the Scripture is, of course, the Lord.
If one believes the gospel, he is saved.
If one believes a false gospel, he is damned.
Due diligence of the individual is expected.
I believe we can substitute Scripture for "Gospel" in your post and end up with the same problem:
Is it the Gospel or a false Gospel - according to whom.
How would you answer this objection to your position:
this concept of Scripture [Gospel] places the final authority in the reason and judgment of each individual believer. The result is the relativism, subjectivism, and theological chaos that we see in modern Evangelicalism today.