You added: Missed a topic....regarding compound unity.
You forgot to expound on Genesis 1:26 and 27:
26 And God said, Let us make man in our image, after our likeness: and let them have dominion over the fish of the sea, and over the fowl of the air, and over the cattle, and over all the earth, and over every creeping thing that creepeth upon the earth.
27 So God created man in his own image, in the image of God created he him; male and female created he them.
This is a simple one to refute. The bottom line is that again, Christian doctrine is using incorrect principles of hermeneutics, reading into the text (eisegesis) a doctrine that is not there (trinity). If G-d were a trinity of persons, He would say so explicitly and plainly, given that it is so important. But no, G-d say he is alone, no other besides Him, no other Savior, etc. He never says anything like, I am G-d, I am made of father son and holy spirit etc. On the contrary, he expressly his divine singular unity.
Regarding Gen 1:26, this from Rabbi Singer
Us . . . Our . . . Our. God speaks as the Creator-king, announcing His crowning work to the members of His heavenly court. (see 3:22; 11:7; Isaiah 6:8; I Kings 22:19-23; Job 15:8; Jeremiah 23:18)2
Charles Caldwell Ryrie, a highly regarded dispensationalist professor of Biblical Studies at the Philadelphia College of Bible and author of the widely read Bible commentary, The Ryrie Study Bible, writes in his short and to-the-point annotation on Genesis 1:26,
Us . . . Our. Plurals of majesty.3
The Liberty Annotated Study Bible, a Bible commentary published by the Reverend Jerry Falwell’s Liberty University, similarly remarks on this verse,
The plural pronoun “Us” is most likely a majestic plural from the standpoint of Hebrew grammar and syntax.4
The 10-volume commentary by Keil and Delitzsch is considered by many to be the most influential exposition on the “Old Testament” in evangelical circles. Yet in its commentary on Genesis 1:26, we find,
The plural “We” was regarded by the fathers and earlier theologians almost unanimously as indicative of the Trinity; modern commentators, on the contrary, regard it either as pluralis majestatis . . . No other explanation is left, therefore, than to regard it as pluralis majestatis . . . .5
The question that immediately comes to mind is: What would compel these evangelical scholars -- all of whom are Trinitarian -- to determinedly conclude that Genesis 1:26 does not suggest the Trinity, but rather a majestic address to the angelic hosts of heaven? Why would the comments of the above conservative Christian writers so perfectly harmonize with the Jewish teaching on this verse?
The answer to this question is simple. If you search the Bible you will find that when the Almighty speaks of “us” or “our,” He is addressing His ministering angels. In fact, only two chapters later, God continues to use the pronoun “us” as He speaks with His angels. At the end of the third chapter of Genesis the Almighty relates to His angels that Adam and his wife have eaten from the Tree of Knowledge and must therefore be prevented from eating from the Tree of Life as well; for if man would gain access to the Tree of Life he will “become like one of us.” The Creator then instructs his angels known as Cherubim to stand at the gate of the Garden of Eden waving a flaming sword so that mankind is prevented from entering the Garden and eating from the Tree of Life. Let’s examine Genesis 3:22-24.
Then the Lord God said, “Behold, the man has become like one of Us, to know good and evil. And now, lest he put out his hand and take also of the tree of life, and eat, and live forever” -- therefore the Lord God sent him out of the Garden of Eden to till the ground from which he was taken. So He drove out the man; and He placed cherubim at the east of the Garden of Eden, and a flaming sword which turned every way, to guard the way to the tree of life.
This use of the majestic plural in Genesis 3:22-24 is what is intended by the NIV Study Bible’s annotation on Genesis 1:26 (above). At the end of its comment on this verse, the NIV Study Bible provides a number of Bible sources from the Jewish scriptures to support its position that “God speaks as the Creator-king, announcing His crowning work to the members of His heavenly court.” The verses cited are: Genesis 3:22, 11:7, Isaiah 6:8, I Kings 22:19-23, Job 15:8, and Jeremiah 23:18. These verses convey to the attentive Bible reader that the heavenly abode of the Creator is filled with the ministering angels who attend the Almighty and to whom He repeatedly refers when using the plural pronoun “Us.”6