God exists outside of our timeline. From our perspective, God did know all about us from all eternity.
“Before” God willed the universe into existance, there was nothing. While there was yet nothing, God asked himself a question. “If I will an Adam and Eve into existance, will they fall into sin?”
God intends to give Adam and Eve the gift of freewill. I believe that, while there was yet nothing, God did not know the answer to the question he asked himself. I simply don’t think God could know the answer to this and still give Adam and Eve the gift of true freewill.
I do not think this counts as a strike against God’s omniscience (his quality of knowing all truths and believing no falsehoods) because there existed nothing, and there was therefore nothing to know about.
God then exercised his will, said the words “Let there be…” and the universe (including Adam and Eve) existed. Being outside of our timeline, God did not have to “wait and see” how things turned out. Immediately after saying “Let there be…” God’s knowledge of his new universe immediately became complete. God knew Adam and Eve fell into sin.
This is my belief. I don’t know if there is anyone out there who believes this also.