[Romulus]

Excuse me, but how do we know that it’s backed by the Triune God?

And since the Koran and Book of Mormon are self authenticating, my earlier question remains for your response.

[kosciusko51]

Excuse me, how do we know the Roman magisterium is backed by the Triune God?

The Bible is self-authenticating because of prophecy which validates it. The same is not true of the BOM and the Koran.

[daniel1212]

And since the Koran and Book of Mormon are self authenticating, my earlier question remains for your response.

Actually "self authenticating" means that both are dependent upon authoritative writings of the Bible, which they reference and abuse. In contrast, the NT conflates with and compliments the OT in text and in power, and which writings themselves became established like as men of God were, essentially based upon manifestly Divine enduring qualities and attestation.