* God must learn, as He would not know what decisions people could make in the future.
* God could be wrong about something, as He has no way of knowing what decisions people could make at a later point in time. Whatever He plans could be thwarted.
* If open theism is true, then God cannot simply be all-knowing. If He is not all-knowing, then it is difficult to see how He can be all-powerful. You cannot say that God is omniscient (meaning that He knows all things) and then affirm that God does not know something in the very next breath. That is affirming A and not A at the same time in the same relationship.
Even a cursory glimpse at Scripture is sufficient to expose the errors of open theism. It outrightly affirms that God knows the future perfectly (Psalm 139:4; 16; Isaiah 46:9-10; Jeremiah 1:5; Matthew 26:34; 1 Peter 1:2; 1 John 3:20). Nothing is beyond His comprehension (Psalm 147:5). Nothing is hidden from His sight (Hebrews 4:13).