Before moving on, I would like to suggest an alternative.
Is it not possible, since God is all knowing that he could see all possibilities the extend outward from the current timeline? If anything, all that is required for this to exist is for you to increase the power of God, which I don't believe any Xian would have an issue with.
Assuming there is an all powerful god, I don't have any issues at all with assuming that he has a complete knowledge of the full 4D universe and all potential permutations of it caused by free will.
The only thing that God doesn't know, is what choices we will make. However, he is fully aware of all possible outcomes of those choices.