I know what free will means. But if god determines the outcome of all events by decree, then we have no free will.
Now, if god only determines certain events, then we have free will in those he doesn't determine.
The other issue is infallible omniscience. If every action and decision has to correspond to the one god already knows we will make, then they are all inevitable so any sense of free will is merely illusory.
When I think of this question I am reminded of Jesus' reply to Satan in the wilderness. Satan told him to jump off the cliff. Jesus refused because he said one was not to put the Almighty God to the test. Therefore he would not give in to Satanic devices. (Matthew chapter 4 NIV)
"Then the devil took him to the holy city and had him stand on the highest point of the temple. 6 “If you are the Son of God,” he said, “throw yourself down. For it is written:
“‘He will command his angels concerning you,
and they will lift you up in their hands,
so that you will not strike your foot against a stone.’”
7 Jesus answered him, “It is also written: ‘Do not put the Lord your God to the test.’”
So Jesus had free will, but he reasoned properly about his relationship to God.