The following link leads to the article, “The Trinity in Seventh-day Adventist History” by Merlin Burt, E. G. White Estate Branch Office, Andrews University
biblicalresearch.gc.adventist.org/documents/Trinity%20in%20SDA%20History.pdf
The next link leads to the article, “The Doctrine of t he Trinity Among Adventists by Gerhard Pfandl or the Biblical Research Institute, Silver Spring, MD written in June 1999
scribd.com/doc/16355113/Trinity-Doctrine-Among-Sda
For those interested, The Biblical Research Institute was established as a service department by action of the Seventh Day Adventist General Conference Committee in 1975. The historical roots of the institute go back to the Defense Literature Committee (established 1943) and the Committee on Biblical Study and Research (established 1952).
What is significant about Pfandl’s definition is that he actually defines the Trinity as not only a “unity of three persons” but actually says they are of “one substance.” This is the Catholic definition of the Trinity. If Pfandl is correct that this is what the SDAs believe, then they are in fact Trinitarian Monotheists and I am mistaken in accusing them of being polytheists. Of course, the question is when did they become monotheists? It should be noted that in Burt’s article, he points out, “The current unambiguous statement on the Trinity in the Seventh-day Adventist Fundamental Beliefs was revised and voted at the 1980 General Conference Session.” Pfandl’s article was written in 1999. Have the SDAs only been bona fide monotheists for the last 31 years? To my mind, the even more important issue is that Pfandl’s article is the only place in SDA literature that I have found it clearly stated that SDAs believe that the three Persons of the Trinity are consubstantial. One would think that if this was in fact part of SDA understanding of the Trinity, it would be more widely disseminated.
The 1957 edition of Questions on Doctrine discusses the SDA doctrine on the Trinity. It also discusses Christ and Michael, the Archangel. The link to the on-line version is:
sdanet.org/atissue/books/qod/index.htm
It should be remembered that Questions on Doctrine was published to make SDAism acceptable to evangelical Christianity. It is as notable for what it does not address as for what it does.