Molinism has problems

If God did not know and decree all things and his knowledge and decree was not simple, but rather his decree is based on God's foreseen knowledge of contingent beings; so that what God knows about the creature is not certainly based on His decrees but rather on the free choices of the creatures; and if even his knowledge of the creatures action was not certain; but rather God's knowledge only meant he knew what creatures could do given a set of choices, then on what basis can we say God knows anything at all?