What is the Christian belief on reincarnation?
Christians do not believe in reincarnation; they believe in the unique existence of every human person. In part, this means that each human being has a particular beginning in space and time. There was a time when each one of us did not exist at all. In other words, Christians do not believe that in a previous life you were another person or perhaps a lesser being in creation.
Also, eternal life from the Christian point of view does not have to do with living through a series of human lives through human history but rather living one human life as yourself, and then living eternal life as the same person, first in the spirit in heaven, and then in the body when Christ returns.
—Ben Witherington III