Everyone makes their own decisions in life, otherwise it would be unjust for God to create us and force us to go to heaven or hell.
Gods knowledge does not impact the decision we make. Imagine yourself on a hill watching a car driving and it is going to hit another person on the other side. You can yell and tell the driver to slow down and the driver does not. You know there will be an accident but you are not responsible for it. This is the same, Gods knowledge of things does not mean He is forcing them. He has knowledge because He is not trapped in time and knowledge is His essence.