Where in the Old Testament

Good post but again it does not say "I God will have a son born of my loin."

It simply says she will be a virgin. That does not have to mean a sexual virgin. Virgin also means pure, like virgin oil or virgin forest.
.

Romans 1:18-32

18 The wrath of God is being revealed from heaven against all the godlessness and wickedness of men who suppress the truth by their wickedness, 19 since what may be known about God is plain to them, because God has made it plain to them. 20 For since the creation of the world God's invisible qualities--his eternal power and divine nature--have been clearly seen, being understood from what has been made, so that men are without excuse. 21 For although they knew God, they neither glorified him as God nor gave thanks to him, but their thinking became futile and their foolish hearts were darkened. 22 Although they claimed to be wise, they became fools 23 and exchanged the glory of the immortal God for images made to look like mortal man and birds and animals and reptiles. 24 Therefore God gave them over in the sinful desires of their hearts to sexual impurity for the degrading of their bodies with one another. 25 They exchanged the truth of God for a lie, and worshiped and served created things rather than the Creator--who is forever praised. Amen. 26 Because of this, God gave them over to shameful lusts. Even their women exchanged natural relations for unnatural ones. 27 In the same way the men also abandoned natural relations with women and were inflamed with lust for one another. Men committed indecent acts with other men, and received in themselves the due penalty for their perversion. 28 Furthermore, since they did not think it worthwhile to retain the knowledge of God, he gave them over to a depraved mind, to do what ought not to be done. 29 They have become filled with every kind of wickedness, evil, greed and depravity. They are full of envy, murder, strife, deceit and malice. They are gossips, 30 slanderers, God-haters, insolent, arrogant and boastful; they invent ways of doing evil; they disobey their parents; 31 they are senseless, faithless, heartless, ruthless. 32 Although they know God's righteous decree that those who do such things deserve death, they not only continue to do these very things but also approve of those who practice them.

Well, I did my best.

Given God's past relationship with the Jews, maybe he foresaw Jesus might be a problem for them and was deliberately vague about Jesus' coming?

I don't think that says anything, there are countless sons of God in the bible almost too many to mention.
.

Uhmmmmmm??? Selectively picking are we?

How do you feel about this statement?

Why was he not vague about the Messiah being born of a line of David?

Why do Matthew and Luke both name Joseph as the father and show his line of descent back to King David?
.

well, I think you just answered your own question. Haha.

Exactly, so there is not truth what-so-ever that Jesus was God's son. Zip, it is all piss and wind, absolute bullshit.

Never does God say he will birth a son of his loin.

All he says is his servant will be highly raised and the one verse in the OT says he will be called Mighty god. That's it.
.

Good post but again it does not say "I God will have a son born of my loin."

It simply says she will be a virgin. That does not have to mean a sexual virgin. Virgin also means pure, like virgin oil or virgin forest.
.

It says he will be called, Mighty God. Not that he is.

Jesus himself said he was the Son of Man. It was others who called him the son of God.

This verse correctly predicts people would call him Mighty God.