Christians are not to be unequally yoked. By writing for Deseret a Christian would be giving tacit approval of Mormonism.
“Be ye not unequally yoked together with unbelievers: for what fellowship hath righteousness with unrighteousness? and what communion hath light with darkness?” (2 Corinthians 6:14)
The Gospel Defined and Discerned
http://www.sermonaudio.com/sermoninfo.asp?SID=81901181950
Unmasking the False Gospel
http://www.sermonaudio.com/sermoninfo.asp?SID=1010665821
The devil (and/or angels) would be in the details.
This would mean you couldn’t advocate being Mormon (and even that under the assumption that Mormons are not Christians, rather than being confused Christians).
It doesn’t mean you can’t sound off about why Christ is so special to you.
I would like to respond to this with an anecdote I heard in one of my favorite sermons from Steven Furtick at Elevation Church (but which I’ve found elsewhere since then):
There was a Christian lady who lived next door to an atheist. Everyday, when the lady prayed, the atheist guy could hear her. He thought to himself, “She sure is crazy, praying all the time like that. Doesn’t she know there isn’t a God?”
Many times while she was praying, he would go to her house and harass her, saying “Lady, why do you pray all the time? Don’t you know there is no God?” But she kept on praying.
One day, she ran out of groceries. As usual, she was praying to the Lord explaining her situation and thanking Him for what He was gonna do.
AS USUAL, the atheist heard her praying and thought to himself. “Hmph . . .I’ll fix her.”
He went to the grocery store, bought a whole bunch of groceries, took them to her house, dropped them off on the front porch, rang the door bell and then hid in the bushes to see what she would do. When she opened the door and saw the groceries, she began to praise the Lord with all her heart, jumping, singing and shoutin’ everywhere!
The atheist then jumped out of the bushes and told her, “You ol’crazy lady, God didn’t buy you those groceries, I bought those groceries!”
Well, she broke out and started running down the street, shouting and praising the Lord. When he finally caught her, he asked what her problem was . . .
She said, “I knew the Lord would provide me with some groceries, but I didn’t know he was gonna make the devil pay for them!”
Sometimes God uses the enemy to accomplish his good works.