I'm surprised Christians claim to know so much about souls... if I remember correctly the Bible only mentions souls and the afterlife in a very vague way - something about wailing and grinding of teeth, chaff getting burned, be with me in the kingdom of God etc.
A lot of material relating to reincarnation was removed from the Bible.
You can still find some parts of the Bible that clearly reference rebirth; here is a helpful reference:
http://www.near-death.com/reincarnation/history/bible.htmlYou can find extensive detail about life and death in the eight-volume Pleiades Connection series of Phoenix Journals (Journals #22 and #31-37); available here:
http://www.phoenixsourcedistributors.com/