1) First of all, we are agreed that it is about his works, and not the works of man.
2) Secondly, it is not about his omniscience, it is about his foreknowledge. . .they are not the same thing.
Omniscience is knowledge, foreknowledge is execution of what was foreordained to be executed at some point in time.
Acts 15:18 - 'Known to the Lord for ages is his work.'
Isaiah 48:3 - 'I foretold (predestined) the former things of long ago,
my mouth announced (decreed) them, and I made them known;
then suddenly I acted (executed), and they came to pass.'
See Acts 2:23, 4:28; Isaiah 37:26.
God executed in their present the choice and purpose he made (predestined) before they were created;
i.e., he executed (accomplished) his foreknowledge (his previous choice and purpose)."
3) Thirdly, Scripture gives no "time line" for Isaiah 48:3 of how long ago this foreknowledge is and, therefore, "from eternity to eternity" cannot be excluded, particularly since God is eternal and does not exist on a timeline. We can't blame eternal on the pagans.
Sorry, that "blasphemy" cannot be escaped if God is both omniscient and Creator, which he is.
It's baked into creation.
Areed. . .however, we must understand it correctly.
However, Acts 15:18, is not about his omniscience of all things, but is about his foreknowledge of his works, which foreknowledge is not a matter of observation, but a matter of God's decreed action, per Isaiah 48:3.
Not at all. . .his foreknowledge regarding the universe is of all his actions, to the end of time, not just of creation.
Acts 15:18 is not about "full knowledge;" i.e., omniscience, it's about divine foreknowledge, two different things, the former a matter of observation, the latter a matter of decree and action.
God is not omniscient if he does not know all things, past, present and future.
Your God is too small, and his arm is too short.
Isaiah 48:3 presents God's foreknowledge as decreeing his future actions, which actions are the subject of his foreknowledge.
Divine foreknowledge is about God's future actions, not about man's future actions.