hi, I realize this is an old post, but I want to throw in my 2 cents worth! I hope no one is offended by some bible stuff?
I want to say three things. 1) before we can have a discussion, I think it would be good to define our terms. 2) What science/doctors say about this, and 3) what I think the bible says about this subject.
1) the meaning of the word "soul" seems to have changed over time. In the NT, book of 1 Thessalonians 5:30, it talks about the spirit, soul, and body. but if we look at the Strong's definition for that word, it says "heart". Spirit, heart, and body. Also, if we look at Genesis we can see the the soul is the body. So it makes no sense to say spirit, soul, and body. That's like saying spirit, body, and body.
In Genesis when Adam was created it says God breathed into his nostrils the breath of life and Adam became a living soul. If Adam was to die right then, what would he be? a dead soul, right? what would be dead? the body. Later in Genesis, it says that Abraham came from some city and brought with him 60 souls. 60 ghosts? No. 60 living people. In the first part of the OT, the soul refers to the body. I think there is a mistranslation going on (deliberate or not, I don't know) and I think it really brings a whole new dimension to the idea, "did you sell your soul to the devil?" So technically, we don't have an inner part named soul. We have a spirit, a soul (aka body), a heart. According to Ecclesiastics our spirit is a gift from God. It animates the soul. And when we die the spirit returns to God who made it. All other parts of us, if the doctors are correct, are DNA based. personality and everything.
2) the doctors also say that we are conceived as twins. (or perhaps multiples). In the first few weeks of conception, they can't determine the gender as there is a fierce hormonal "battle" going on between testosterone and estrogen. The other baby is absorbed into the one who "survives". That means that every bit of DNA--our dreams, our inherited skills and talents, our personalities, etc--are absorbed into person. Therefore we are two-souled people, though perhaps with the appearance of having only 1 body, and yet, (at least) two personalities.
3) This section is in part straight bible, and some of it is my theory. The bible says that in the beginning he made THEM [emphasis mine] male and female. He made THEM (plural). each separate entity was male AND female. Let's think about the Amazons for a moment. The word means A (without) mazos (breasts). "They" say that the Amazon woman will sometimes burn off or remove a breast so they can shoot with the bow and arrow. As a female, I can tell you that didn't happen!!
No, these people were born that way. So "man" in the first week of creation was created male and female without genitalia and with a womb. (Ok so a few things have changed since then!)
Now in Ephesians 2 it says... for to make in himself of twain one new man, so making peace; 16And that he might reconcile both to God in one body by the cross....so I think this means that we are suppose to....instead of arguing with ourselves, live in peace with the other personality.