If I ask you to "Pick a card. Any card," I know all possible outcomes. What I don't know is which one you'll pick and thus, I am not omniscient.
Unless we're going to say that omniscience is more akin to Epimetheus rather than Prometheus, there is still the problem of if you know what I am going to do and cannot be wrong, is there any possible way for me to do something else?
Yeah, I think this was the bit I was struggling with when I asked if the idea was logically sound. a) Does omniscience imply that the entity knows absolutely what decision an individual makes at a given decision point? If so, does that logically constrain the individual (i.e., no "free will")? b) Is it more like quantum uncertainty: all possible outcomes are known, but which particular outcome occurs is unconstrained (i.e., "free will" exists)? In this case, it might be possible to claim that your entity-of-choice established the ground rules in this fashion to permit free choice. It would mean that the entity purposefully set constraints on its OWN capabilities to grant free will to its creation (which gets into the whole omnipotent question.)
Tis a puzzler. I suppose these are the kind of profound angel-on-a-pinhead questions that have preoccupied the religious forever. Kinda wish they'd stick to those.