Im saying that God knows when we freely choose Him and doesn't know when we freely choose otherwise. (depart from me I never knew you)
In Matthew 7:23 Jesus was referring specifically to false prophets but more generally to doing good works as opposed to paying lip service to religion. He used the word "know" not in the sense of knowing facts but in the sense of knowing a person. What he was saying was, "You were never my friend." It has nothing to do with omniscience. In fact, the implication was that He DID omnisciently know all along that you weren't his friend, even though you claimed you were.
Of course that position assumes that God is using the same moral system and perspective as we are and our moral system and perspective is malleable and changes with time, culture, era, society and mythos.
If there is a god with a timeless moral system, I don't see how that's relevant to us.
Personally I think that what annoys many people is the whole idea that they can never decide to do something apart from what God knows.
No, God is perfectly welcome to go through my files.
What annoys me is the idea that God already has my place in Hell reserved, that I don't even know yet what it is that will send me there but He does - and YOU have the gall to suggest that its my choice.