What type of God doesn't know everything? God is just sitting in heaven surprised "OH NO, another heresy popped up, no WAY i didn't see that one coming!"
I too have this same line of thought when considering this debate. I've asked them "Are you really arguing Gods ignorance?", because to me that seems to be the argument. Why would you even want to follow a God who just "didn't know"?
Isaiah tells us in 46:8-13
8 “Remember this and stand firm,
recall it to mind, you transgressors,
9 remember the former things of old;
for I am God, and there is no other;
I am God, and there is none like me,
10 declaring the end from the beginning
and from ancient times things not yet done,
saying, ‘My counsel shall stand,
and I will accomplish all my purpose,’
11 calling a bird of prey from the east,
the man of my counsel from a far country.
I have spoken, and I will bring it to pass;
I have purposed, and I will do it.
12 “Listen to me, you stubborn of heart,
you who are far from righteousness:
13 I bring near my righteousness; it is not far off,
and my salvation will not delay;
I will put salvation in Zion,
for Israel my glory.”
He is saying He "declares" the END from the beginning. Not He waits to see it. He tells us in plain language over and over again that it's all going down EXACTLY the way He "declared" it would, and for me to buy for one second that God has "blind spots" or "doesn't know" anything is incompatible with the God who gave me new life. I honestly can only think of one reason anyone would even want this to be the case. They have to keep their "choice/freewill" right above God's sovereignty. I am not accusing anyone of being/thinking/believing this, I just mean that from the perspective of me giving it thought myself. I honestly doubt anyone thinks of it like this who makes this case to be clear. I always try to add that I can follow the logic behind this line of reason, but I just no longer agree with it. The idea that we EVER have a "free will" isn't true in my mind anymore. Our will is ALWAYS enslaved to our natures. We are a slave to sin, or a slave to Him.
I of course believe we have a will and that we make choices, I am not trying to pretend that isn't made VERY clear in His word that we are to choose righteously, and now strive to obey God in every way. We are told that as well, but you have to ignore a ton of scripture that very specifically and plainly tells us we are "called", "Chosen", "Predestin", "elected", "drawn to Him", "gifted repentance", and a bunch more along those lines, and it tells us these things in very precise and plain language. How does God's sovereign will work with every persons will to bring about His plan? I don't know, but I do know trying to pretend I have some kind of power over even God with my choice is a delusion, and arguing God's ignorance honestly makes NO sense to me at all either.