You may appreciate something I heard RC Sproul say: "God knows all contingencies, but he does not know contingently." While I like that, I don't even agree with someone so eminently Reformed as RC Sproul simply because he is Reformed. I disagree that there are multiple possibilities. If "contingencies" mean possibilities, then I disagree with what Sproul said. God does not know something, if it is not.
But show me where he says something may or may not occur. The only ones that come to mind for me are (to me) him speaking according to our thinking, not saying that more than one thing is possible, but giving us the options from which to decide what to do.
Though I know we disagree, I appreciate your "tone." I'll share some verses:
“If so be they will hearken, and turn every man from his evil way, that I may repent me of the evil, which I purpose to do unto them because of the evil of their doings.” (Jeremiah 26:3) (If...they turn...I will change my mind and course of action - he is saying that what he will do depends on what they will do; that he purposes to bring calamity to them, but he will change his mind if they repent).
And the LORD God said, Behold, the man is become as one of us, to know good and evil: and now, lest he put forth his hand, and take also of the tree of life, and eat, and live for ever: Therefore the LORD God sent him forth from the garden of Eden, to till the ground from whence he was taken. (Gen. 3:22-23) (Lest he - God is saying if he left him there he would take also of the tree of life - it was clearly a possibility according to God himself)
And it came to pass, when Pharaoh had let the people go, that God led them not through the way of the land of the Philistines, although that was near; for God said, Lest peradventure the people repent when they see war, and they return to Egypt: (Ex. 13:17) (A range of possibilities was acknowledged by God)
And it shall come to pass, if they will not believe thee, neither hearken to the voice of the first sign, that they will believe the voice of the latter sign. And it shall come to pass, if they will not believe also these two signs, neither hearken unto thy voice, that thou shalt take of the water of the river, and pour it upon the dry land: and the water which thou takest out of the river shall become blood upon the dry land. (Ex. 4:8-9) (God did not say when he doesn't listen, but IF)
For if God spared not the natural branches, take heed lest he also spare not thee. (Romans 11:21) (Their fate was not settled)
Therefore, thou son of man, prepare thee stuff for removing, and remove by day in their sight; and thou shalt remove from thy place to another place in their sight: it may be they will consider, though they be a rebellious house. (Ezekiel 12:3) (It may be)
Again, I know you disagree, but these verses (and plenty of others) show God himself speaking of certain events in the sense that they were not foregone conclusions. I know (and I am not saying this in an ugly manner) that you will say that God was just speaking on terms that people can understand, but if he had to do that - who could claim they know when he is doing so or not? Even though you disagree, I hope you at least see that those of us who say that some of the future is settled and some of it is open is because we are taking the scriptures at face value.