[Vasu]

Ok, God knows everything and can do everything. But if his plans for something were wrong, he could change them. but since he always makes the right decision, and he's benevolent, he would have no need to change his plans.

So if he "could" change them, that makes him non-omniscient right?

See, if he foresaw picking option A, he, in effect, foresaw NOT picking option B. Now the point is whether or not he can (or could) change to option B, regardless of whether option A is the best possible.

And as for the stone thing, i'll use a metaphore: If God were Superman on a stronger level, he would be able to lift anything and know anything and do everything. However, if he touched some Kryptonite (in God's case, simply powering himself down) he could MAKE himself not able to lift the gigantic rock.

So in his full power mode, he would not be able to make a rock too heavy for himself to lift.