Where it is in the Holy Bible about The book of Mormon? What is the necessary 2 Christian for another testment

According to the Holy Bible God never do anything without informing his prophets. So, without any written evidence in the Holy Bible how can we say that Bro. Joseph Smith was a prophet of Almighty God. Where and when God has said like that in the Bible that in future one prophet named Joseph will come on earth to restore the Gosple. They are preaching like all christians are wrong except Mormon people, What does it means? The Mormon is found in 1820, so are thy mean that before 1820 there is no faith and no christianity? Is it according to Holy Bible? I strongly believe it is nothing but We are in endning days.Satan is working strongly. We must have to beware of it. Should not loose our faith in God. Amen