? is this the logical end of protestant thinking?
That is hardly classic Protestant thinking, as it holds that Scripture is the only assuredly infallible material authority, and thus the supreme standard for obedience and testing truth claims, and materially providing for the church;
The authenticity of which was and is based upon Scriptural substantiation and the manner of supernatural attestation it affirms being given to Truth and men of God. To the glory of almighty God.
Now may i and we who believe better attest to His reality myself.