You are the one saying if he does/has to, it means he's not omniscient. To me, that's a typical human attempt to put God in a box.
I realize this omniscient, therefore everyone must be predestine, belief is a big part of the Calvinist doctrine - it ain't mine.
Later...
Psalm 139:2-6
You know when I sit down and when I rise up;
You understand my thought from afar.
You scrutinize my path and my lying down,
And are intimately acquainted with all my ways.
Even before there is a word on my tongue,
Behold, O LORD, You know it all.
You have enclosed me behind and before,
And laid Your hand upon me.
Such knowledge is too wonderful for me;
It is too high, I cannot attain to it.