You're talking as if God doesn't know a person until He "observes" their behavior. Are you an Open Theist?
TD
This is an interesting point.
I decide to pick up a pen. If you read my mind you would see the intention.
Would you be right to conclude I will pick up the pen?
Only when I actually do pick up the pen, because between the intention and action things can change.
So we have faith, we know Jesus, we respond to the words our hearts are open.
When the words come, it is real, it is the fulfilment of what let up to that point.
But until then it is just a potential.
Jesus illustrates this in a parable of two sons.
There was a man who had two sons. He went to the first and said, 'Son, go and work today in the vineyard.'
"'I will not,' he answered, but later he changed his mind and went.
"Then the father went to the other son and said the same thing. He answered, 'I will, sir,' but he did not go.
"Which of the two did what his father wanted?The first," they answered.
Matt 21:28-31
So people say they have faith, yet nothing changes or comes into existence.
They are deluded.
Only when things actually show their presence are they really there.
Because the Father see things outside time, He knows the end, but knowing the end does not mean until things occur, they are real. People believe they can have a position in Christ but it not show, as if this is what Christ meant by the gospel.