Eh. I have my own ways of circling that square. For example, the first thing the Bible tells us about God is that he creates. I would call this a Big Hint.
In fact, I seriously doubt that God cannot not create, meaning that he is an infinite and inexhaustible source of novelty and surprise, even -- or especially -- to himSelf. As I mentioned in a comment, some things are awesomer than omniscience, one of them being creativity. Frankly, omniscience would constitute a mega-life sentence of infinite and eternal boredom, of total stasis.
For Schuon, the existence of evil is at once unavoidable and impermissible. That is, the creation is necessarily more or less distant from the Creator, and this distance, you might say, is measured in degrees of evil. In other words, evil is a privation, a privation that is ultimately "necessary" if we are to be truly free.
It's like light and shadow. Light doesn't "create" shadow, but nevertheless, the privation of shadowhood occurs wherever there is light. Likewise necessity and accident. Contingency must be parasitic on necessity, because the converse is impossible.
Now, everything is ultimately the Divine Substance, or Godstuff. But if one looks at it the wrong way, this can be as intellectually barren as flatland materialism.
Rather, "If we compare the Divine Substance with water," writes Schuon, "accidents may be likened to waves, drops, snow, or ice..." From the standpoint of transcendence we're all wet, but from the perspective of immanence we are like snowflakes, each one a unique and unrepeatable instantiation of the Principle. Religion -- good religion, anyway -- respects this complementarity.
Predestination tries to deal with the complementarity by eliminating it and defaulting to transcendence. But it seems to me that the incarnation of the Word is the last word in this complementarity: it is as if the Sovereign Good -- AKA Love -- instead of abiding in his timelessness only at the top, prolongs itself all the way to the furthest reaches of manifestation, to hell even. For they shall call his name Emmanuel, which is, being interpreted, 'God with us.'
Not only is Godwithus, but God is the very ground and possibility of withus, which is to say Trinity. For what is the Trinity but an eternal perichoresis of I AM He as You Are He as You Are Me and We Are all together?
The point is, otherness is built into God. That's what you call a profound metaphysical point, one full of implications.
Conversely, it is easy to reconcile omniscience with a theological monism, the one simply entailing the other. But how is a trinitarian God different from this tedious oneness? For starters, the Father doesn't "entail" the Son, as in some logical necessity. Rather, he begets him, which is another martyr entirely, for God is the ultimate Fertile Egghead, infertility and absence of creativity being a privation. And there are many ways to be fruitful!
Some if not most people will reject my approach as heterodox instead of orthoparadoxical. But what if creation isn't linear but circular -- as if God throws himself into being, and the spiritual journey involves the return adventure, which is ultimately God's return to himself? Is this a Permissible Thought?
I'll just quote this passage from one of our favorites, W. Norris Clarke, regarding the moment-to-moment structure of the Journey, which has two main phases. First, the Many are
projected outward from the One, their Infinite Source, by creation.... This can be called the Journey away from Home, where creatures actively unfold their diverse dynamic natures as finite participants in the divine perfection and as centers of self-expressive and self-communicating action and intention with each other, thus forming a universe (uni-versum in Latin = turned toward unity)...
This is (immediately!) followed by
The Journey of the Many back again towards reunion with the One, their Source, drawn by this same Source through the pull of the Good built in to the very nature of every being through the mediation of final causation [AKA the Great Attractor].
Thus God as the ultimate One now appears as both the Alpha and the Omega, the Beginning and End, at once the Source and Goal of the restless dynamism of all of nature, of all finite beings.... And since the journey Home, back toward the Source again, can never be the same as the journey away from Home, the structure of the total journey [is] aptly imaged in the form of a circle...
So, I guess you could say that God is omniscient with regard to Alpha and Omega. But in between, anything might happen!