Mary Ettie V. Smith, recalling her endowment in 1846/1847, notes that the identity of "God" became a point of debate; some believed "God" in the Endowment was Adam.
Nelson Winch Green, Fifteen Years Among the Mormons (New York: Charles Scribner, 1858), 47-48
[In the Nauvoo Temple] We were next led into what is called the Terrestrial Glory; where Brigham Young received us, and after a long effort to explain the disgusting scene in the "Garden," as necessary to our future exaltation, he gave each a pass-word and grip necessary, he said, to admit us into the "Celestial Glory;" where our (i.e. Mormon) "god" dwells. Some say this is Adam; and some that Joe Smith is to be our "god," and afterwards, Brigham Young intimated, that he (Brigham) was the medium of our salvation, and that Joseph was his "god." They did not all agree upon this point; but they do agree upon another thing, and that is: that there are many gods . . .