Again, you assume this. God did not stop Adam or Eve for a purpose, and that was to carry out with His will. As much as we Calvinists hold true to John 6, John 10, Romans 8, Romans 9, Ephesians 1, which all support election, we also hold true to every other minute detail of Scripture, including that part in James 1:13, where it says, "Let no one say when he is tempted, 'I am being tempted by God'; for God cannot be tempted by evil, and He Himself does not tempt anyone."
And as much as we hold true to those, we also hold true to Romans 1, where it is said that God gives people over to their fleshly desires. He doesn't cause it, but He doesn't stop them either, in fact, He hands them over to do what they want, which leads them to their own condemnation. And to His saints, His Holy Spirit is imputed into them.
Every minute detail in history that has come to pass, and in the future that is still to come is ordained by God.