No need to do that, they already are Christians.
The term Christian simply means "one who professes belief in the teachings of Jesus Christ". They do believe in the teachings of Jesus Christ. They believe in the teachings of the Old and New Testaments. Go to www.lds.org for answers.
There is not a "mormon Jesus", They love and accept as their Savior and redeemer Jesus Christ, the Son of God who was born in Bethlehem to Mary, who went about his life performing miracles, proclaiming His divinity, and who ultimately atoned for the sins of the world in Gethsemane, who was crucified and rose on the 3rd day so that all may one day live again.
In addition, many "proofs" that are offered as to why Mormons aren't Christian simply don't stand up when applied to other groups who also don't fit whatever definition you may be using.
As an example: Mormons don't adhere to the Nicene Creed, however that was not standardized until several centuries after Christ's death, so by that definition, you would alse be excluding as "non Christian" those early Christians who lived and died before that point. Now as far as how to convert a Mormon to Christianity, there is no one "method" that works for every Mormon who has ever left Mormonism and come to the true Jesus. For some, it is a matter of showing them scriptural proof that their religion is wrong. For others, the focus may need to be on the false prophecies of Joseph Smith and Brigham Young. Some may be more easily reached by explaining to them the errors and inconsistencies in the Book of Mormon and other Mormon Scriptures. There are two important things to remember, no matter what you do: Cover the Mormon with prayer, and show them love every time you talk to them. Show them compassion. Don't try to yell them to the truth, it never works. The Bible says they will know we are Christians by our love. Mormons are just like anyone else; they respond to the love of God. There are many good websites on witnessing to Mormons; I will put a few links in the Related Links area that may help. But remember to be PATIENT. Many Mormons who have come to Christ and left Mormonism later say that it took several years for them to see the truth. "Rome wasn't built in a day," as the old saying goes.
Mormon
Henry Eyring - Mormon convert - was born in 1835.
Henry Eyring - Mormon convert - died in 1902.
Trying to convert them into Christianity
to convert many people to Christianity
no hes actually some form of Christianity
Vladimir I ordered his subjects to convert to Orthodox Christianity.
Constantine
Absolutely not.
Christianity.
No.
In the summer of 386 Augustine converted to Christianity.