Your mixing probabilities : "My kid will probably eat that cookie", with definitive outcomes. There is a difference, you and This_Person keep trying to mix a probable outcome with a forseen conclusion.
If Omnipotent God, forsees you turning right, you cant' then turn left.
I think you're mistaking omnipotent
omnipotent
c.1314, from O.Fr. omnipotent (11c.), from L. omnipotentem (nom. omnipotens) "all-powerful, almighty," from omnis "all" (see omni-) + potens (gen. potentis) "powerful" (see potent). Strictly only of God or a deity; general sense of "having absolute power or authority" is attested from 1598.
with all knowing.
How about if I try and explain it this way. You're watching the live broadcast of a speech given by your favorite politician, and he/she says "God bless America" at the end of the speech. Now, two hours later, you're watching a rebroadcast of the same speech. You know "God bless America" will be how the speech ends. Does that mean that your favorite politician had no free will to make that statement?
God is the Alpha and the Omega. That means the beginning and the end, and all things in between. He is in the present, the future, and the past. Time is meaningless to Him, as we understand it. It could be viewed as Him watching the speech's rebroadcast, because it's already happened, and yet will happen, and is happening to Him.
You have your free will to do as you please, and he knows whether you will, are, or have gone to the right or left or straight.