Honest struggles on God’s omniscience.

[way 2 go]

Why was that necessary if he had already been declared righteous? (Gen 15:6, as you pointed out)

Abraham received a saving act of grace by God and was faithful thereafter

And he was already known to be faithful extending to his family? i.e., it didn't appear to be because of the interrupted sacrifice of Isaac that Abraham was faithful thereafter.
Genesis 18:19 KJV — For I know him, that he will command his children and his household after him, and they shall keep the way of the LORD, to do justice and judgment; that the LORD may bring upon Abraham that which he hath spoken of him.

verse showing God's foreknowledge
Genesis 18:19 KJV —

So if there's no gain for eather God or Abraham, why go through it at all?

Abraham received a saving act of grace by God and was faithful thereafter

Rather it was part of a process of God testing Abraham, first to leave his homeland, then to trust for a new home, then to trust for a child-heir (from Sarah), then to trust for God's provision no matter what (he was confident that God could raise him from the dead, even:
Hebrews 11:19 KJV — Accounting that God was able to raise him up, even from the dead; from whence also he received him in a figure.
But not at first. Abraham was not that trusting at first. He didn't think God could give him a child by Sarah. So the testing came over 25 years until Isaac was born, then another bunch of years (unspecified, but I'd propose 15) until the almost sacrifice.

so not testing God

we the readers have God prophesying his own sacrifice for the sin of the world scape goat and all.

(Romans 4:16) Therefore it is of faith, that it might be by grace; to the end the promise might be sure to all the seed; not to that only which is of the law, but to that also which is of the faith of Abraham; who is the father of us all,

Did God do this for Abraham's gain or God's? Why not both? Abraham grew in knowledge of God, why can't God grow in knowledge of Abraham? Isn't it only because you have already decided that God already knows all future things based on other verses that don't require it?

Abraham grew in faith , God already knew ,Genesis 18:19

(Job 21:22) Shall any teach God knowledge, since He shall judge the exalted?
(Romans 11:34) For who hath known the mind of the Lord? or who hath been his counsellor?

 

[Right Divider]

verse showing God's foreknowledge

Again, you can't seem to understand the difference between "foreknowledge" and "EXHAUSTIVE foreknowledge".

They are NOT the same.

NOW I KNOW means something.

Gen 22:12 (AKJV/PCE)​

(22:12) And he said, Lay not thine hand upon the lad, neither do thou any thing unto him: for now I know that thou fearest God, seeing thou hast not withheld thy son, thine only [son] from me.​

 

[way 2 go]

Again, you can't seem to understand the difference between "foreknowledge" and "EXHAUSTIVE foreknowledge".

They are NOT the same.

NOW I KNOW means something.

Gen 22:12 (AKJV/PCE)​

(22:12) And he said, Lay not thine hand upon the lad, neither do thou any thing unto him: for now I know that thou fearest God, seeing thou hast not withheld thy son, thine only [son] from me.​

Imagine a man who has known his best friend for many years. He knows his friend deeply — his character, his habits, and especially that he loves to bluff in poker.One day they sit down to play. His friend goes all-in with a terrible hand. After the cards are revealed and the bluff is exposed, the man says, “Now I know you love to bluff.”Would we understand this to mean the man just learned that his friend likes to bluff? Of course not. He already knew it. His statement “Now I know” is not a declaration of new knowledge, but a public confirmation and demonstration of what he already knew to be true.In the same way, when God says to Abraham in Genesis 22:12


After David committed adultery with Bathsheba and had Uriah killed, God sent the prophet Nathan to confront him.Nathan did not walk in and say, “You committed adultery and murder.”
Instead, he told David a story about a rich man who stole a poor man’s only lamb. David became outraged and said the rich man deserved to die. Then Nathan delivered the blow:

(II Samuel 12:7) And Nathan said to David, Thou art the man.

then God's judgement came

God knew what David had done and foreknew that David would incriminate himself
God exposed David’s sin in a way that would lead to genuine conviction and repentance also let David’s own sense of justice condemn his actions.

 

[Right Divider]

@way 2 go You're going to believe whatever you want to believe. You are impervious to evidence or arguments against your position. You know nothing about the view that opposes yours and you like it that way. Enjoy your ignorance.