The two questions I have is this, if the Mormons call themselves “Christian” why do traditional Christians do not accept the Mormon baptism and also why the extra book called the “Book of Mormon”, which in Revelation there is a warning not to either add or subtract from, the Holy Bible?
Because they baptize in the name of gods plural -- gods who aren't the ultimate ONE TRUE God.
...and also why the extra book called the “Book of Mormon”, which in Revelation there is a warning not to either add or subtract from, the Holy Bible?
Well, they've added three extra "books" as "scriptures" (Pearl of Great Price; Doctrines & Covenants).
In these books, they portend a distinct way of salvation ("saved by grace AFTER ALL YOU can do" - 2 Nephi 25:23)...
...they redefine "salvation" itself as attaining godhood -- btw, NOT taught in the Book of Mormon and NOT defined in the D&C.
What is also "interesting" is that Mormons in these kind of articles -- and dialogues with Christian leaders -- don't seem to want to finish the phrase they call Christians. What their doctrine really teaches is that we are supposedly Christian "apostates" who embrace 100% "abominable" creeds.
Since they must deem it "polite" not to repeat what their "scriptures" & "teachings" teach in our faces, they just pretend that they teach that Christians are Christians and they are "Christians, too" -- just a distinct form of them.
What they don't usually elaborate in newspaper articles and press releases and dialogues of this nature is commenting on how "corrupt" we are; how and where our creeds are an "abomination" and how we are "apostates."
For instance, if 100% of Christian creeds are an "abomination" -- as Joseph Smith said the unnamed entities told him in the "First Vision" -- why and where is the Apostles Creed abominable?
I challenge any Mormon to elaborate where the Apostles Creed sharply disagrees with Mormon theology. [Please note that at the time the Apostles Creed was written the word "catholic" -- small "c" -- meant "universal"...and not Roman Catholic].
Don’t go down the “add or subtract” argument. It is full of holes. That statement in revelation refers to THE Book Of Revelation. The bible is a collection of BOOKS.
I think that one of the main reasons for the non-acceptance of the Mormon baptism is the fact that you have to accept Joseph Smith and declare that the Mormon church is the one true church. In that statement Mormons extract themselves from the body of the christian church which does not reside in a building.