It is written in the scriptures that Jesus will return to Earth one day and raise the dead to be Judged with the living.
There were many people that were born and lived on Earth before Jesus lived as a man. How will those people be judged? They didn't reject the gospel, they lived and died before Gospel was present. What will happen to those people? They didn't get a chance to choose the Gospel or reject it.
Would God give them a second chance? Would he make them live again or just know what they would do already? What would happen to all those people? Would they all share the same fate?