There is only two logical ways God knows who would believe… and
only one is biblically justified.
1) God determined his own knowledge.
2) God “learned” his knowledge from an external source.
Logically, before creation existed there was nothing outside of God to “learn” from that could determine his knowledge of what will certainly happen in the timeline of creation.
This means if something other than God determined any part within the timeline of creation then God could not logically know it before he created the “determiner”… unless he learned it from that non-created external source.
If God does know for certain, before creation, and there is nothing outside of God, before creation, then logically God is the determiner of what he knows will certainly happen in the timeline of creation.
The only biblically justified logical opposition to the philosophical view of Open Theism is…
God knows because he Planned, Purposed, and Determined all things that will happen within the timeline of his creation before he brought it into existence.
Therefore Gods “foreknowledge” is God’s exhaustive knowledge of the results of his own actions.
You may assume something other than this view, but you have zero biblical justification to support other than this view.
“The LORD has made everything for its purpose, even the wicked for the day of trouble.” (Pro 16:4)
Example: God created Pharaoh for a purpose and the end result of that purpose was not to “save” him!
“For the Scripture says to Pharaoh, “
For this very purpose I have raised you up, that I might
show my power in you, and
that my name might be proclaimed in all the earth.”” (Rom 9:17)
“What if God, desiring to show his wrath and to
make known his power, has endured with much patience
vessels of wrath prepared for destruction, in order to make known the riches of his glory for vessels of mercy, which
he has prepared beforehand for glory—” (Rom 9:22-23)