Mike182 said:
maybe, but id still love to hear your beliefs on the subject
Okies!
But I hope no one asks me to back it up with proof!
I think that the realm of the spirit began simply as a mass of energy. (In the terms of spiritual energy- a soul,
ki, whatever one wishes to call it.) This sphere, for whatever reason, decided to shake. It shook like a dog shaking water from its fur, and bits of the energy flew off in all different directions. Each bit is what we would think of as a soul, an individual spirit.
Each is comprised of an 'oversoul'. (A fancy word simply meaning the sum of your nature and the wisdom that you've 'picked up' over your incarnations thus far.) While reincarnation may not hold any truck with linear time, I think that the oversoul does carry a memory of what you've been and, in a sense, what you will be. I think that most creatures, in whatever form they are currently, carry with them the (usually subconcious) memory of the form in which they were first incarnated. (For instance, I've got a friend whose first spiritual 'memory' is of being a rose bush. Thus, all of her other incarnations have been affected by that.)
I don't know if everyone gets reincarnated or not, but I think that the issue with the immense population growth only arises if one believes that only humans have souls.
With all the incredible varieties of Spirit in this realm, alone, we'd be hard pressed not to find souls for the numerous new people that are joining us.