I am trying to grasp the existence of souls as separate from our physical bodies. Are souls created at the moment of conception, or do they already exist beforehand? On a biological level, it seems that the penetration of a human egg by a sperm cell is hardly a metaphysical event. On a religious level, however, the Bible says that Jesus (The Word) existed even before Mary became pregnant.
This suggests to me that other souls may exist prior to human conception as well as after physical death. In that case, it seems that these eternal souls might inhabit our bodies only during our lifetimes before being reincarnated in someone else's body. Is this antithetical to Christian or other religious beliefs? If so, please explain.