You conflate God's omniscience with what He does not do in regards to evil. Evil cannot exist without good. And God, the infinite good God, did created evil only in that He created finite good which can be deprived (Isaiah 45:7, ". . . create evil: I the LORD do . . . ." The knowledge of good and evil that man obtained is God's knowledge (Genesis 3:22). And God is the infinite good.
It is the Determinist who conflates God’s Omniscience with evil, not I. Not in a million years would you hear me attribute evil to God, no evil can be said to be from God, zero, zilch, nada despite your proof-text, Isaiah 45:7, which you apparently believes proves otherwise. FYI, I would and most certainly do argue against the Classical Theological view that puts God’s knowledge in a box while claiming since God is Omniscient he must have pre-determined
all things.
In no way does Gen 3:22 declare that man has obtained God’s knowledge. God’s knowledge is perfect as is His judgment, do you really think God is saying man has obtained this?! Quite the opposite, the message here is man being made in the image and likeness of God, who believed the lie of the Devil and wanted to be as God, IS NOT GOD, his knowledge do not compare to God's, and NOW with his knowledge of good and evil, which he gained of his own volitional will, man falls short of the perfectly good state in which God designed him. Man who was designed with sense, reason and intellect and willfully gained knowledge must NOW put his new gained judgment aside, because there is Only One God who determines/judges good from evil in the Kingdom of Heaven, and man must now just as freely take again the action of putting forth his hand to eat of the tree of life to live.
Gen 3:22 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: