From Can God Learn Anything:

Premise three says a being’s omniscience entails that a being has all experiential knowledge. Omniscience entails that a being has all experiential knowledge. That, I would say, is false. That is not the classical definition of omniscience. Remember, I said to be omniscient a being must know every true proposition p and believe no false proposition. So that means that omniscience is defined in terms of propositional truth, not in terms of experiential truth. So being omniscient does not entail, for example, knowing how it feels to have a sore back. God knows that having a sore back involves having pain and is uncomfortable, that’s propositional knowledge. But God doesn’t know himself what it’s like for his back to be sore, because he doesn’t have a back. Or he doesn’t know how it feels himself to be a sinner. Now, he knows the proposition that being a sinner feels lousy, feels guilty, feels depressing, he knows those propositions, but he doesn’t know how it feels to be himself a sinner. Or he doesn’t know what it is to be himself Bill Craig. He knows how Bill Craig feels, that’s propositional knowledge. But he doesn’t have to have the experiential knowledge of believing that he is himself Bill Craig. You see what I mean? So classically omniscience is not defined in terms of non-propositional knowledge. It is defined in terms of propositional knowledge, and there is no incoherence with God having all propositional knowledge. So, again, the objector here is saying that God cannot have the experiential knowledge of knowing what it is like to learn something. Now, I think that’s false, as I’ve already explained, I think God does know what that’s like, but that’s not entailed by omniscience. God doesn’t need to have experiential non-propositional knowledge in order to be propositionally omniscient. And that is what the doctrine of omniscience means.