There is no born-again Christians all over the world. No one lives in any form after death and therefore there is no rebirth. Sometimes situations and circumstances force even good people to do sin.
God cannot watch each and every human being at the same time and cannot live with each and everyone to guide them. That's why He had created different kinds of spirits for various purposes. He had made the spirits to watch, guide and determine the destiny of the human beings from their daily activities, talks and thoughts too. Your past determines your present and your present determines your future. God has given freewill to all creatures including human beings. According to this, all human beings have all right to live a life as they wish. But if it happens to be bad and hurts someone, they have to face the consequences. These consequences are created by spirits. It's a natural system. After death no one lives in any form. Heaven and hell are only for spirits. Spirits are separate elements. A human being during his/her life time is living with many spirits which have joined one by one since birth. They are knowledge, skills, feelings, emotions, interests and everything. Even thoughts are not your own. For example, when you want to take a decision on a subject, one after another the spirits think and you just listen, choose or reject the ideas which they transmit to your mind through your brain in the form of thoughts. Brain is just a media to connect the spirits to your mind. A mind is just a computer's mind. After the destruction of a computer completely you will not get it's mind. The same is the case with the human beings. Soul is nothing but an energy needed for the functionality of a body. It is not a spirit or anything else. A human being is just a robot made of flesh and bones and a toy of the spirits for their games.
If you know the truth you will understand yourself that reincarnation is not at all possible. To form a reincarnation all spirits which lived with a body must possess another person together. Then only he/she can feel same thing of the demised person. But this is not happening because the spirits never stay together to haunt or possess another. They go to different bodies. Rarely there might have been certain cases but I think it had changed after some time. Spirits during their life time live with many bodies (one after another). Their memories sometimes affects the person. This is natural. This is not enough to believe that there is rebirth. No one returns after death. A human's life ends with a single body.