But He still knows what we will choose before we are even born, doesn’t He?
‘Yes, it is His will that we all choose good, life, and communion with Him; however, it is also His will that we be free to make those choices.’ Are His wills then, in conflict with each other when He creates those that He knows will not choose good?
Since He is beyond our understanding, why do so many people profess to know what God does, and why?
Yes. He knows what we will do, but does not make us do it. We do what we will.
'Yes, it is His will that we all choose good, life, and communion with Him; however, it is also His will that we be free to make those choices.’ Are His wills then, in conflict with each other when He creates those that He knows will not choose good?
His desire is that everyone choose to live in communion with Him, and in all other matters His desire is reality -- he is Almighty. However, He does not exercise His almighty power when it comes to human deeds. He allows us to exercise our own free will in that decision. He could, of course, force us to be good, but He does not.
Since He is beyond our understanding, why do so many people profess to know what God does, and why?
We can know certain things about God, by means of both reason and revelation. We cannot, however, know everything about God, because God in his fullness is eternal, infinite, and in all ways beyond our comprehension. We can know Him best physically in the Person of Jesus Christ, and internally in the Holy Spirit. However, only those who go to Heaven will ever know God as He is in all His glory. "For now we see through a glass, darkly, but then face to face: now I know in part; but then shall I know even as also I am known" - (I Cor 13:12).