Mormons will tell you that you can know that Mormonism is the true Christian Church by just praying to God and asking Him. At that time, they say, you will experience a burning sensation in the chest accompanied by feelings of peace which they call the Burning Bosom. This, say Mormons, is proof that the Mormon Church is the true Christian Church and the true church of God.
This is despite the fact that Joseph Smith himself said he had made incorrect decisions based on such a Burning Bosom experience and the senior leader Boyd K. Packer in the 1983 LDS Ensign magazine in an article titled “Candle of the Lord” admitting that relying on the Burning Bosom can easily lead to following Satan or one’s own emotions and it is not possible to tell the difference. Packer wrote as as follows:
Be ever on guard lest you be deceived by inspiration from an unworthy source. You can be given false spiritual messages. There are counterfeit spirits just as there are counterfeit angels. Be careful lest you be deceived, for the devil may come disguised as an angel of light.
The spiritual part of us and the emotional part of us are so closely linked that it is possible to mistake an emotional impulse for something spiritual. We occasionally find people who receive what they assume to be spiritual promptings from God, when those promptings are either centered in the emotions or are from the adversary.
Boyd K. Packer, “The Candle of the Lord,” Ensign, January 1983. Mr. Packer in his address offered no way to discern between the emotional, Satanic and Godly witnesses.
In my opinion it is very easy to tell that the Mormon Church is not a Christian church. And that is because in the First Vision of Joseph Smith in which he received his first messages from the spirit world he was told to reject all the Christian Churches and all Christian belief.
Later accounts say that when the personages appeared, Smith asked them “O Lord, what church shall I join?” or “Must I join the Methodist Church?” In answer, he was told that “all religious denominations were believing in incorrect doctrines, and that none of them was acknowledged of God as his church and kingdom.” All churches and their professors were “corrupt”, and “all their creeds were an abomination in [God’s] sight.”
Here then is the basis of Mormonism: Reject all Christian Churches and all Christian belief.
Existing Christian belief would be replaced with a message which would later be given to Smith. This became The Book Of Mormon and associated other Mormon teachings.
Given the foundation of Mormonism, it is easy to see that the Mormon Church is not Christian, but Anti-Christian.