Knowing the outcome does not mean the decision doesn’t exist.
Let’s imagine I have an exam next week.
I know (to an extend) that if I don’t study I won’t do well at my exam. This knowledge, however, does not take away my option of not-studying. I know the **possible **outcome, but still I choose not to study and rely on “luck”.
This “luck” would be all that which I do NOT know, such as that the teacher might cancel the test, that the school might close for some reason on that day, or that my guessing might net me enough points to pass.
God is in a different situation. He knows all the outcomes of my decision. He knows that, even if I don’t study, I’ll pass due the teacher spilling coffee on my papers (and passing me just because). But God knowing all that still doesn’t take away MY choice; I am the one who chose to study or not.
As God lives outside of time, He can see beyond. He knows what is going to happen and the choices we are going to make. But just because He’s already seen the end, doesn’t mean He had a hand in our decisions.
I don’t know how to better explain. Do you know how to play Chess?
If you do, think like this. You and everyone else are the two players. God is a supercomputer watching our game. For every move you make, God calculates every single possible outcome.
As you move to capture a Bishop instead of a Pawn, for example, God already knew you’d make that move (He did calculate every possibility).
But the free will to make that move was still there. Although God knew you’d make that move, He didn’t prod you nor told you to move there. Had you made another move and, instead, captured the Pawn, God also saw that before you did. He knew, it was no surprise.
God also can see into the future, so He knows who’s going to win, in every possible scenario. So, if you end up losing, God knew that beforehand. If you win, God knew that too. If you tie? Yeah, God saw that eons ago.
But you are the one playing the game, not Him. So your choices are yours, even though the guy who put the game for you to play already knows the outcome.
That might complicate things a bit, so please have patience with us. If we don’t understand at first we might get irritated. It happens.