“God is omniscient.”
......”a truly sovereign God knows what will happen—without being a cause—and the outcome is still what He wants.”
Both of your statements raise a couple of questions;
Isn’t the salvation procured by Jesus an intervening cause?
Can a person freely choose differently than what was known about him before he was born?
You are defining “known about him” differently. You are implying causation. God knows what the perfectly free decision will be. The decision is still ours, and we are perfectly capable of making that decision—either direction.
Not only that, but one might as well toss out any and all miracles. Why would God make an axe head float? Why make the Red Sea part? Why even heal the sick? The fact is our God IS a very intervening God who is directly at work in our lives to effect His plan. The fatalist or determinist is really one who believes that God is not directly involved with man.