Why is Reincarnation disregarded by Christian religions?

Wow, this is a great question. I love it when people make me think about something I never would have imagined on my own. I myself believe in reincarnation and it is cool to see some idea of it in the Bible also. Don't let the deadbeats get you down, it is funny to see those who take a version of history that they approve of as absolute truth and call everything else lies when there is so much misinformation out there about any subject. How can anyone know that one source on a subject 1500 years ago is more reliable than another when we can't even sort out the lies of yesterday?