John 10:16. Jesus was resurrected and told that he had to bring forth other sheep which are not of this fold. (Of this land by his speaking, of the Bible by way of understanding the scripture) He was 33 when he died, and since we know the years are counted based on Christ's birth, we know that it was in 33 AD that he was crucified and killed. 3 Nephi 11 takes place in 34 AD and, get this: Jesus descends down to them and lets them know He is the Christ. That is NOT a coincidence. Wanted con man? Have you forgotten, or better yet, decided to not educate yourself on the fact that Smith was forced to relocate with his followers numerous times due to persecution and DEATH THREATS? This happened until 1843 where he was once again, persecuted for his beliefs and thrown into Carthage Jail in Carthage, Illinois (I know it's different today, but that's besides the point) where a mob overran it and he was martyred at age 38. Following this, Brigham Young lead the remaining followers out into what was at the time, the Utah Territory, where they finally able to reside without fear of constant persecution.
I take it you also forgot that he was READING THE BIBLE and failing to understand why people understood scripture the way they did and came upon James 1:5. He then went out into the wilderness to pray and was met with the presence of God The Father and His Son Jesus Christ, at just 14 years old. He was then in a period of being spiritually tested and prepared for 3 years before he was finally led to the Golden Tablets by the Angel Moroni after 4 YEARS of preparation for them. He then spent the next 2 years TRANSLATING the plates from their original Reformed Egyptian text (Mormon 9:32 tells of the language). If you want to denounce it, READ IT. Compare it to events that it mentions that we see in the Bible (IE Moses delivering the people out of Egypt as seen in 2 Nephi 3:10). Also, every chapter is timestamped in the Book of Mormon, so that should help a lot. And, for the record, The Book of Mormon testifies of these Lost Tribes of Israel. Read it. With an open mind. You will walk away from it a different person.