Does a biblical style show Joseph wrote the Book of Mormon?

They really did exist. The Virginia Gazette printed a satire using “and it came to pass” to describe a proclamation. Biblical English was available to writers talking about their own time.

You grant a real literary resemblance and give a concrete example. That makes the remaining question easier to identify.

People in early America could never have produced a book that sounded like the Bible.

The surviving early American examples already show people writing in that style. The harder question concerns this particular book’s origins.

Genesis uses the phrase too, and the later texts use it before different events. Is there an unusual match beyond that phrase or evidence Joseph had access to Leacock?

You check the common source and ask for evidence that would actually favor the proposed borrowing.

A single common phrase is enough to show where Joseph got the English wording.

A biblical expression available to both writers has little power to identify one later text as the source of another.

Repeated wording and plots could make improvisation easier. Which templates would the theory predict, and do they explain passages outside the examples already selected?

You distinguish a proposed composition process from a borrowing claim and ask what evidence could test it.

Because other writers could use a formula, Joseph must have used the same process.

The analogy suggests a possibility. Establishing the process in 1829 requires evidence about this text or its production.