Does the Book of Mormon (& LDS doctrine) pass the test found in 1 John 4:2 as the true spirit of God? Do Mormons agree that part of their trust in the book of Mormon (and the LDS church doctrine) is that it agrees with the following scriptures as a kind of litmus test is discerning the truth from the false in this world?

This is how you can recognize the Spirit of God: Every spirit that acknowledges that Jesus Christ has come in the flesh is from God, (1 John 4:2)
If anyone confesses that Jesus is the Son of God, God abides in him, and he in God. (1 John 4:15)
Everyone who believes that Jesus is the Christ is born of God, and everyone who loves the Father also loves the one born of Him. (1 John 5:1)
For many deceivers have gone out into the world, refusing to confess the coming of Jesus Christ in the flesh. Any such person is the deceiver and the antichrist. (2 John 1:7)

Does the LDS church “acknowledge that Jesus Christ has come in the flesh” and confess His name as the above scriptures suggest?
David, I admire your research into the Church of Jesus Christ of Latter Day Saints, LDS, or the Mormons. :)
In the Book of Mormon we read;

Moroni 10:32 - Yea, come unto Christ, and be perfected in him, and deny yourselves of all ungodliness; and if ye shall deny yourselves of all ungodliness , and love God with all your might, mind and strength, then is his grace is sufficient for you, that by his grace ye may be perfect in Christ; and if by the grace of God ye are perfect in Christ, ye can in nowise deny the power of God.
Moroni 10:33 - And again, if ye by the grace of God are perfect in Christ, and deny not his power, then are ye sanctified in Christ by the grace of God, through the shedding of the blood of Christ, which is in the covenant of the Father unto the remission of your sins, that ye become holy, without spot.

I find it interesting that you use the word &quot;test&quot; in your question. As a young member of the LDS Church, we do maintain the belief in that Jesus Christ has &quot;come in the flesh&quot;(1John,4:2) and that he came for the remission of our sins.
As I said, I am a young member of the LDS church and I am still studying myself the Book of Mormon and other teachings of my church. I am confident that there are others on this site with more studying under their belt that may be able to answer your questions more fully. I hope I could shed a little light into what you are in search of.
Thanks!