While not an actual question someone left in the question box, it is a top entry in Google’s autocomplete for “What do Mormons…”
Mormons really believe in God, our Eternal, Heavenly Father, in Jesus Christ, the Son of God and our Savior and Redeemer, and in the Holy Ghost, who testifies of both the Father and the Son.
We really believe in the power of the Atonement of Christ in daily life.
We really believe that God still communicates His will to people on earth directly and prophets exist in the same way they did in biblical times to teach God’s will to the people generally.
Besides revelation and prophecy, we really believe in miracles and in the power of God on earth, and that the priesthood, the authority to act in God’s name, has been restored to the earth.
We really believe the true gospel that has been taught since the days of Adam.
We really believe the Bible and the Book of Mormon to be the word of God and that further words from God will be given to us as He deems necessary.
We really believe in being good people and serving our fellow man.
We really believe that by following the commandments, we can live fuller, better lives because they are given by a loving God who has our best interests first.