Been there done that...
You have receive the answers a thousand times to those questions...
BTW they were not lost just stolen.
Anyway if you have no answer about Rev 14:6 or the missing scriptures and how is one to in John 5:39 “Search the scriptures; for in them ye think ye have eternal life: and they are they which testify of me”,
...when so many books are missing as stated in the Bible?
Could it be in the Lord’s wisdom prepared for his children through the Book of Mormon...
2 Nephi 29:3 And because my words shall hiss forth—many of the Gentiles shall say: A Bible! A Bible! We have got a Bible, and there cannot be any more Bible.
2 Nephi 29:10 Wherefore, because that ye have a Bible ye need not suppose that it contains all my words; neither need ye suppose that I have not caused more to be written
About 559–545 B.C.
No.
Because it contradicts Scripture found in the Bible.
The word BIBLE wasn't invented yet!
***..when so many books are missing as stated in the Bible?***
Simple. Some of the books probably were added to other books, and some were probably secular books.
Isaiah for example is probably three authors combined, and some have Ezra-Nehemiah together. And some are simply history which was not Holy so not saved.
Just because men of God referenced some writings not in the bible does not mean that those writings were “Holy”.
St Paul quoted pagan authors and Jude referenced Enoch. That does not mean these works by Pagan authors are considered Holy Writ.
But then, by your own words you only have 1/3 of the BOM.