ByGrace said:
They really need to read their "most correct book on earth"
The Book of Mormon is a history of the people, brought forth for:
1. show unto the remnant of the House of Israel what great things the Lord hath done for their fathers
2. and that they may know the covenants of the Lord, that they are not cast off forever
3. And also to the convincing of the Jew and Gentile that JESUS is the CHRIST, the ETERNAL GOD, manifesting himself unto all nations (Book of Mormon Title Page)
The Doctrine and Covenants is where you'll find information about
baptism for the dead
washings and anointings
endowment ceremony
eternal marriage
becoming a god
etc.
Will it spell out details and wording of the ordinances and covenants of the temple? No, but that's for people who are willing to make those covenants to receive. But the principles of each one of those items you listed are in the D&C in plainess, which outlines the administration of the Lord's kingdom on the Earth. The BoM and D&C were written for different purposes, and so you may not find those Doctrines spelled out in the same way in the BoM as they are in the D&C. Please do not misconstrue: I am NOT saying that either book is less true for this reason.
As for the [apparent] plagiarism, let me give you an example from the same article I have referred you to in the past regarding translation.
http://library.lds.org/nxt/gateway.dll/Magazines/Ensign/1977.htm/ensign%20september%201977.htm/by%20the%20gift%20and%20power%20of%20god%20.htm?fn=document-frameset.htm$f=templates$3.0
And I'm paraphrasing quite a bit: If Joseph Smith were translating the Book of Mormon, by whatever means you'd like to consider, and he came across a passage that was familiar, would it not be logical for him to consult the Bible and copy the already translated text (from Isaiah for instance), checking it to make sure it was consistant with the work he was translating? After all, what better way to check your work than with God's word from the Bible? We know from the Nephites' records that they had access to OT writings from before they left Jerusalem, so it is entirely plausible that they would insert some writings from earlier prophets.
~b