That’s what the LDS teaches.
Actually, if you red the Bible, that's what is says, so all Churches that teach the Bible technically teach that. The slam comes from saying it that way and using occult terminology and assigning it to Mormons.
This is such a common smear that I have a section on it on my Page at FR:
Here
I am going to include the section here:
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Do Mormons Believe Jesus and Satan are brothers?
That depends on what you mean by brothers, suffice it to say that is not a "Mormon" teaching you will hear stated in Sunday school, but we believe the Bible, so consider the following scriptures:
Hebrews 12: 9 9 Furthermore we have had fathers of our flesh which corrected us, and we gave them reverence: shall we not much rather be in subjection unto the Father of spirits, and live?
So God is the Father of Spirits...
2 Peter 2: 4 4 For if God spared not the angels that sinned, but cast them down to hell, and delivered them into chains of darkness, to be reserved unto judgment;
So Satan was once an angel, and was cast out of heaven.
Hebrews 1:7 7 And of the angels he saith, Who maketh his angels spirits, and his ministers a flame of fire.
So angels have Spirits and can call God Father.
1 John 1:34 34 And I saw, and bare record that this is the Son of God.
So Satan was once an angel, Angels have a spirit, and God is the father of Spirits, also Jesus is "The Son of God" therefore,according to the Bible, they are brothers. We believe the Bible, so.... we believe that Jesus and Satan can be called brothers just like everyone who believes the Bible.
What is misleading is that this is presented as a shocking belief when it is just Biblical.
One of the Twists of phraseology is to call Satan "God's Brother" which is a phrase from the occult, and thus Phrasing this question this way makes a belief which all who believe the bible to be the word of God, cannot deny to sound like we are part of the Occult, which is the point of the question. So, when did you stop beating your wife...
Fair Mormon addresses this same topic here.
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So either, you are not a Bible believer, or you believe the same thing, either way, it's just an unfair attack to put something like this together and attack a political candidate with it. It should and Did (I believe) hurt the Huckster in the long run.
Why do I call him "huckster", because he
Lied (cooperating with McCain, Mormonism, not purposefully using crosses in his commercials, etc). I have no problem with a man of God, I do have a problem with anyone who claims to be a man of God, then lies and makes men of God look bad. that's my opinion.
BTW, I still plan to write in Fred Thompson, so I'm not a mitten, but I am a Mormon living in Utah, and figure the day Hillary wins here only the dead will have voted if you know what I mean.