Since God knows all does this mean we can't change our fates? That those who are saved are all saved and those who are damned can't change their fates?
"
16 For God so loved the world that he gave his one and only Son, that whoever believes in him shall not perish but have eternal life.
17 For God did not send his Son into the world to condemn the world, but to save the world through him.
18 Whoever believes in him is not condemned, but whoever does not believe stands condemned already because they have not believed in the name of God’s one and only Son.
19 This is the verdict: Light has come into the world, but people loved darkness instead of light because their deeds were evil.
20 Everyone who does evil hates the light, and will not come into the light for fear that their deeds will be exposed.
21 But whoever lives by the truth comes into the light, so that it may be seen plainly that what they have done has been done in the sight of God."
And, evidently by Christ's words, our direction can be changed also -- Luke chapter 15.
--------------
'whoever does not believe' -- this is for those having fully understood the accurate gospel (not the common partial understanding), and not simply disbelieved because of a mistaken version; also, not merely doubt in the mind, but to fully disbelieve (when hearing the real gospel that Christ came and died for their sins, to save them). If a person only doubts in the intellect but still believes in the heart or soul (on a subtle level, even on a level the person doesn't realize yet), this doubt isn't real disbelief in the Truth, but only a doubting time, like Thomas before Christ showed Him his hands and side. Some who may say they don't believe may in reality at times pray, showing the heart or soul knows better.