Ghost was just doing his job. Finding souls and sending them to the afterlife. Which was what he was trying to do when he met you. Both of you standing in the hospital room with a little girl on the bed and her parents around her. She had been dead for a couple seconds now but you, the god of life, came to give her life back. Was Ghost kinda annoyed that you did that and he came here for nothing? Yes. But maybe it will lead to new things.