Although the Bible doesn't come out and directly declare god to be omniscient (not that I know of), I believe the idea was arrived at by what is said in various scriptures: As for knowing specifically about
future events, I've
highlighted those remarks I believe speak to this capacity.
God is Omniscient - Old Testament Evidence
“ Remember what happened long ago. Remember, I am God and there is no other God. There is no other like me.
“
In the beginning, I told you what would happen in the end. A long time ago, I told you things that have not happened yet. When I plan something, it happens. I do whatever I want to do.
” (Isaiah 46:9-10).
“Who can fathom the Spirit of the LORD, or instruct the LORD as his counselor? Whom did the LORD consult to enlighten him, and who taught him the right way? Who was it that taught him knowledge, or showed him the path of understanding?” (Isaiah 40:13-14).
“Before a word is on my tongue you know it completely, O LORD” (Psalm 139:4).
“O LORD, you have searched me and you know me. You know when I sit and when I rise; you perceive my thoughts from afar. You discern my going out and my lying down; you are familiar with all my ways” (Psalm 139:1-3).
“My frame was not hidden from you when I was made in the secret place, when I was woven together in the depths of the earth.
Your eyes saw my unformed body; all the days ordained for me were written in your book before one of them came to be. How precious to me are your thoughts, God! How vast is the sum of them! Were I to count them, they would outnumber the grains of sand—when I awake, I am still with you” (Psalm 139:15-16).
“He determines the number of the stars and calls them each by name. Great is our Lord and mighty in power; his understanding has no limit” (Psalm 147:4-5).
“And you, my son Solomon, acknowledge the God of your father, and serve him with wholehearted devotion and with a willing mind, for the LORD searches every heart and understands every desire and every thought. If you seek him, he will be found by you; but if you forsake him, he will reject you forever” (1 Chronicles 28:9).
God is Omniscient – The New Testament Evidence
“Nothing in all creation is hidden from God’s sight. Everything is uncovered and laid bare before the eyes of him to whom we must give account” (Hebrews 4:13).
“Indeed, the very hairs of your head are all numbered. Don’t be afraid; you are worth more than many sparrows” (Luke 12:7).
“Whenever our hearts condemn us. For God is greater than our hearts, and he knows everything” (1 John 3:20).
“Are not two sparrows sold for a penny? Yet not one of them will fall to the ground apart from the will of your Father. And even the very hairs of your head are all numbered” (Matthew 10:29-30).
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Your scriptures were nice to read; however,
not all of them pertain to the subject of omniscience, and
the ones that do only claim that God knows all things, even the thoughts we are having at the moment - right now, not the future. Knowing all things that happen right now, and in the past,
do not speak of God knowing all future events in any way. That is reading into scripture what is not claimed. If I know everything, I know everything that is, not what isn't. Thus, it is with God.
He does not know all about what is to come, what still isn't.
Of all the scriptures you quoted, only this one seems to say something about the future and God's knowledge about it: ". . .
I told you what would happen in the end. A long time ago, I told you things that have not happened yet. When I plan something, it happens. I do whatever I want to do.” (Isaiah 46:9-10).
The irony here is what the scripture actually claims, what it says. Examine this, "
When I plan something, it happens. I do whatever I want to do."
This is exactly what I said. God makes things happen in the future by planning, by making come to be by his power, by his angels working to make it happen. That is not omniscience in the way people use it. That is the planning for the future,
not the seeing of the future in a way of having determined all that will ever be.
There is a clear case of God forcing things to become what he wants in the future in the case of Solomon's son who became king. If you want I can find it for you. This was not omniscience, but pertained to God's plans, will for the future which were made to fit what God wanted by him applying power to change the situation.
The following article could use some improvement, the issue is complex, but if you want to, read it:
Truth Seeker - Predestination Debunked