what tools are available to God to decide when a person is born? Does God have a pool of people available to him that he could create?
Furthermore, this argument assumes God has this ability to place people in different situations. Given this, why didn't God only create people he knew would respond? Why didn't he only take those people out of the pool of people? Or to put it another way: why is it necessary that people die? Is it to create the circumstances in which people who would respond will respond.