After 1888, Laodicea, the Seventh-day Adventist church, has wanted to become like the other, partially fallen, protestant churches. She wanted to be liked by them, and not be called names. She finally succeeded when, in 1981, she officially declared her trinitarian beliefs, like all the other protestant churches, thus becoming just another daughter of the Roman catholic church. Thus, the prophecy of Isaiah 4:1 has been fulfilled. (The number seven symbolizes completion or perfection, in Isaiah 4:1, it’s obviously completion – well, nearly all. See 1 Kings 19:18; Romans 11:4,5) But her tares have not yet been purged, and her sins have not been fully revealed. But, they will be:
For nothing is secret, that shall not be made manifest; neither any thing hid, that shall not be known and come abroad.
– Luke 8:17
For there is nothing covered, that shall not be revealed; neither hid, that shall not be known.
– Luke 12:2
Needless to say, the word and concept of the trinity are not found in the Bible; both are foreign to God’s word. Whole churches have been disfellowshipped, all because the Seventh-day Adventists discovered the truth about the one true God, and His only begotten Son. The trinity concept seems to be an almost overpowering delusion. But it’s not difficult to understand, when studying the subject without any preconceived notions. Perhaps these short booklets will help:
The angel of the Seventh-day Adventist church (i.e., the leadership) has also claimed that the Seventh-day Adventist trinity is different from the papal trinity. This is true, as you can see in the pictorial representation:

As you can see, there is a vast difference – ours is in color.
There are also quite a few web sites on the subject now:
https://judgmenthour.org/video-gallery
https://www.theprophetstillspeaks.co.uk
The leadership of the corporate church seems to know the trinity teaching is not in the Bible or the spirit of prophecy:
I’m going to go out on a limb and just state this isn’t going to work out for the tares. Selfishness is a force, like the law of gravity. But Agape is also a force, and a much more powerful force than selfishness. The Truth will always win in the end.