Lay it out for us, then, restornu. Show how the Book of Mormon has unlocked Biblical passages for mainstream faith. A single example using a well-known passage will suffice.
If you sincerely want to know than read the Book of Mormon.
That is how I learn the truth.
No one could tell me I had to find out for myself.
I even told the person who gave me the Book why do you want to go backwards.
At the time I was jaded on religion.
I saw what the mainstream did “say one thing and do another”...
Was I surprise a year later when I did read it and the Spirit of the Lord witness to me!
Oh what joy for me anyway was beyond words.
Not all have that powerful of a conversion.
If you ever get an answer that is actually an answer let the rest of us know.