A. C. Osborn teaches that Latter-day Saints believe Adam/Michael is the God they worship; claims Joseph, by identifying Adam with the Ancient of Days, taught the Adam-God theory.
A. C. Osborn, The Mormon Doctrine of God and Heaven: An Address Delivered Before the Baptist Ministers' Conference of South Carolina, November, 1898 (Nashville: Sunday School Board Southern Baptist Convention, 1899), 33-34
After this conflict, which was perhaps suggested by Milton's Paradise Lost, the word was formed. Michael—who, bear in mind, was God the Father—came down to the world under the name of Adam, with Eve, one of his wives, and took on himself human nature. In accordance with the plan previously agreed upon in the council, he took of the forbidden fruit, and purposely became a transgressor of his own moral law, in order that his earthly descendants might be born with a sinful nature and have the advantage of a knowledge of good and evil.
Thus, in the Mormon theology, Michael, Adam, and God the Father are only different names for the same person. Adam was God; the God the Mormons worship. He was not only the father of human spirits in the previous state of existence, by the actual progenitor of the human race, by his wife, Eve.
That the Mormon books have not been misinterpreted, or their doctrines misstated on this point, there is abundance of evidence. On the 9th of April, 1852, Brigham Young, speaking as the inspired prophet of the church, used this language:
"When our father Adam came into the garden of Eden, he came into it with a celestial body, and brought Even, one of his wives, with him. He helped to make and organize this world. He is Michael the Archangel, the ancient of Days, about whom holy men have written and spoken. he is our Father and our God; and the only God with whom we have to do."
That Adam and God are one and the same is taught by Joseph, the prophet. He speaks of: "Michael, or Adam, the father of all, the prince of all, the ancient of Days."