Apostasy doesn’t just start one day.
So you have no answer. Ok. Here's some more problems.
The Book of Mormon presents problems that cannot be explained away regarding the following topics.
Language: 1 Ne. 1:2, etc., states that Hebrews who left Jerusalem and came to the Americas spoke Egyptian. It is a known fact that Hebrews spoke Hebrew, and their records were kept in Hebrew. Egyptians were their enemies. It is absurd to think that Hebrews would have written their sacred history in Egyptian as to think that American History would have been written in Russian. In Mormon 9:32, 34, it is state that the language was “reformed Egyptian” and that no other people knew their language. There is no known language called “reformed Egyptian.”
Desert Fruit: 1 Ne. 17:5 talks about ample fruit and wild honey being products of Sinai desert (called Bountiful). Not possible!
Desert Timber: 1 Ne. 18:1 talks about ample timber that these Jews used to build a ship. There is not ample timber in that area. It was a desert. It still is a desert.
Laman River: 1 Ne. 2:6-9 mentions a river named Laman that flows into the Red Sea. There is no river there and has not been since the Pleistocene era.
Botanical Problems are many in the Book of Mormon. Wheat, barley, olives, etc., are mentioned, but none of these were in the Americas at that time.
Animals: North America had no cows, asses, horses, oxen, etc. Europeans brought them hundreds and hundreds of years later. North America had no lions, leopards, nor sheep at that time. Honeybees were brought here by Europeans much later. Ether 9:18, 19, lists domestic cattle, cows, and oxen as separate species! They did not even exist in the Americas at that time.
The Book of Mormon also mentions swine as being useful to man. Maybe, but Jews would not think of swine as being useful or good; swine were forbidden, unclean animals to them.
Horses, asses, and elephants were not in the Americas either.
And what on earth are “cureloms” and “cumoms”? No such animals have ever been identified anywhere. Domestic animals that are thought to be “useful” would hardly become extinct.
Ether 9:30-34 talks about poisonous snakes driving sheep to the
south. The Book of Mormon states that the people ate the snake-killed animals, all of them! (v. 34). Hebrews would not have eaten animals that were killed that way.
Chickens and dogs did not exist here at that time either.
Butter is also mentioned, but it could not possibly exist, since no milk-producing animals were found in the Americas at that time.
Clothing Material: No silk and wool clothing (nor moths) existed at that time either, contrary to 1 Ne. 13:7; Alma 4:6; Ether 9:17 and 10:24.
Beheaded Shiz: Ether 15:30-31 says that after Shiz was beheaded, he raised up and struggled for breath!
Miscalculations: In Ether, chapter 6, we learn that furious winds propelled the barges to the promised land for 344 days! Even if the winds were not “furious” but, for example, blew only 10 miles per hour, the distance traveled in 344 days would have been 82,560 miles, or more than three times around the world. Absurdity, to say the least!
And why would the Lord instruct Jared to make a hole on top and bottom of each barge? (Ether 2:20).