8 - Ah... there is a major difference. Just as those in Christ are called "sons of God", Jesus is The Son of God. Likewise as men are called "son of man", Jesus is called "the Son of man" (Matthew 16:13). You thus do a false comparison, not understanding the Scripture.
10 - GOD The Father is one Person, Jesus Christ The Son is another Person, and The Holy Spirit is another Person. All 3 makeup The Godhead per God's Word. They all work together, but they are all distinct.
Since 8 and 10 tie together I will show you where you have made your errors in thought. Man was created a body, soul and spirit.
1 Timothy 2:5
For there is one God, and there is one mediator between God and men, the man Christ Jesus,
1 Thessalonians 5:23
And the very God of peace sanctify you wholly; and I pray God your whole spirit and soul and body be preserved blameless unto the coming of our Lord Jesus Christ.
You claim to know Jewish thought and history. So lets see what it actually teaches.
Lets examine some of Jesus declarations about being the son of man (adam, humanity, a human being). He used this term describing His death, burial and Resurrection from the dead. He also used this phrase about His future Kingdom, Reign and Judgment at the end of the age. This would mean that Jesus not only considered Himself to be human while He walked this earth but also in the future at His 2nd Coming in Judgment. He also describes Himself at the right hand of God as a human post Resurrection/ Ascension.
"Son of man" is a common term in the Psalms, used to accentuate the difference between God and human beings. As in Ps. viii. 4 (A. V. 5), the phrase implies "mortality," "impotence," "transientness,"as against the omnipotence and eternality of God. Yhwh looks down from His throne in heaven upon the "children," or "sons," of "man" (Ps. xi. 4, xxxiii. 13). The faithful fail among them (Ps. xii. 2 [A. V. 1]); the seed of Yhwh's enemies will not abide among the "children of men" (Ps. xxi. 10). "Children of men" is thus equivalent to "mankind" (Ps. xxxvi. 8 [A. V. 7], lxvi. 5).
"Sons of men," or "children of men," designates also the slanderers and evil-doers in contrast to the righteous, that is, Israel (Ps. lvii. 5 [A. V. 4], lviii. 2 [A. V. 1]). It occurs most frequently, however, as a synonym for "mankind," "the human race" (Ps. xc. 3, cvii. 8, cxv. 16, cxlv. 12); it has this sense also in the passage in which wisdom is said to delight with the "sons of men" (Prov. viii. 31). Job(xvi. 21) employs the expression in the passionate plea for his rights while he is contending against God and against his neighbors. But Bildad insists that the "son of man," who is a mere worm, can not be justified with God (Job xxv. 4-6). In the same spirit the prophet (Isa. li. 12) censures Israel for being afraid of "the son of man which shall be made as grass" when Yhwh is their Comforter; but in Isa. lvi. 2-3 the Sabbath is extolled as making the "son of man" (i.e., any man, regardless of birth) blessed; indeed, God has His eyes "open upon all the ways of the sons of men: to give every one according to his ways" (Jer. xxxii. 19). Jewish Encyclopedia
Son of man
— (1.) Denotes mankind generally, with special reference to their weakness and frailty (Job 25:6; Ps 8:4; 144:3; 146:3; Isa 51:12, etc.).
(2.) It is a title frequently given to the prophet Ezekiel, probably to remind him of his human weakness.
(3.) In the New Testament it is used forty-three times as a distinctive title of the Saviour. In the Old Testament it is used only in Ps 80:17 and Dan 7:13 with this application. It denotes the true humanity of our Lord. He had a true body (Heb 2:14; Luke 24:39) and a rational soul. He was perfect man.
(from Easton's Bible Dictionary, PC Study Bible formatted electronic database Copyright © 2003, 2006 Biblesoft, Inc. All rights reserved.)
Matt 12:40
For as Jonah was three days and three nights in the belly of a huge fish, so the Son of Man will be three days and three nights in the heart of the earth.
Matt 13:40-41
"As the weeds are pulled up and burned in the fire, so it will be at the end of the age. 41 The Son of Man will send out his angels, and they will weed out of his kingdom everything that causes sin and all who do evil.
Matt 16:27
For the Son of Man is going to come in his Father's glory with his angels, and then he will reward each person according to what he has done.
Matt 17:9
As they were coming down the mountain, Jesus instructed them, "Don't tell anyone what you have seen, until the Son of Man has been raised from the dead."
Matt 24:27-31
For as lightning that comes from the east is visible even in the west, so will be the coming of the Son of Man.28 Wherever there is a carcass, there the vultures will gather.
29 "Immediately after the distress of those days
"'the sun will be darkened,
and the moon will not give its light;
the stars will fall from the sky,
and the heavenly bodies will be shaken.
30 "At that time the sign of the Son of Man will appear in the sky, and all the nations of the earth will mourn. They will see the Son of Man coming on the clouds of the sky, with power and great glory. 31 And he will send his angels with a loud trumpet call, and they will gather his elect from the four winds, from one end of the heavens to the other.
Matt 24:44
So you also must be ready, because the Son of Man will come at an hour when you do not expect him.
Matt 25:31-33
"When the Son of Man comes in his glory, and all the angels with him, he will sit on his throne in heavenly glory. 32 All the nations will be gathered before him, and he will separate the people one from another as a shepherd separates the sheep from the goats. 33 He will put the sheep on his right and the goats on his left.
Matt 26:64-66
"Yes, it is as you say," Jesus replied. "But I say to all of you: In the future you will see the Son of Man sitting at the right hand of the Mighty One and coming on the clouds of heaven."
65 Then the high priest tore his clothes and said, "He has spoken blasphemy! Why do we need any more witnesses? Look, now you have heard the blasphemy. 66 What do you think?"
"He is worthy of death," they answered.
Acts 7:54-60
When they heard this, they were furious and gnashed their teeth at him. 55 But Stephen, full of the Holy Spirit, looked up to heaven and saw the glory of God, and Jesus standing at the right hand of God. 56 "Look," he said, "I see heaven open and the Son of Man standing at the right hand of God."
57 At this they covered their ears and, yelling at the top of their voices, they all rushed at him, 58 dragged him out of the city and began to stone him. Meanwhile, the witnesses laid their clothes at the feet of a young man named Saul.
59 While they were stoning him, Stephen prayed, "Lord Jesus, receive my spirit." 60 Then he fell on his knees and cried out, "Lord, do not hold this sin against them." When he had said this, he fell asleep.
Rev 14:14
And I looked, and behold, a white cloud, and sitting on the cloud was one like a son of man, having a golden crown on His head, and a sharp sickle in His hand.
hope this helps,