God can guess better than anyone else, perhaps. But in order for you to have true free will, your decisions must remain unknown until you make them. If all your future actions are already written in stone, free will is only an illusion. At best, God can know all of your possible choices and the choice that you are most likely to make. But there always has to be a margin of error for free will to truly exist.
The great heroes of other ancient cultures were strong and clever and virtuous, but the great Jewish heroes copulated with slaves (Abraham), showed they were willing to allow others to have sex with their wives (also Abraham), cheated their brothers, seduced their in-laws, murdered, started civil wars through terrible family decisions, yet somehow-through a mixture of humility, near-insanity, and good fortune-served as conduits of God's action in the world.