No they do not. They mouth the words, but they do not believe in the Trinity or that Jesus cleanses you of all your sins. There are some sins you have to cleanse yourself through the church which is impossible.
If Christ does not cleanse you of all your sins he does not cleanse you of any of them. That is what grace and mercy are about.
There are two Mormon Churches, one you see and one only the Bishops see and that is the one which is not Christian.
Everyone is cleansed through the Atonement of Jesus Christ by accepting him as your Lord and Savior and following his teachings.
We can agree to disagree.