OK TB, in this case and since God knows everything and he knows who will behave in a good way and who will not, so why don't he immediately burn the bad ones?. the answer is simple: coz he wants to give us choice and life to live and decide what to do in it, otherwise we may say "GOD is not fair he burn us before knowing what would we do" but in this case HE will ask u "I am burning u coz u did so and so, fair nO!?"