Thomas G. Alexander discusses John A. Widtsoe's discussion of the Adam-God theory; notes he denied it as being a doctrine of the Church and claimed that Brigham did not teach it.
Thomas G. Alexander, John A. Widtsoe: Scientist and Theologian, 1872-1952 (Salt Lake City: Signature Books, 2023), 153
In his essay on the so-called Adam-God theory, he makes clear that the church does not accept the teaching that Adam was God the Father. He went further to deny that Brigham Young had preached the theory. In this he was mistaken. Young did preach the doctrine.