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"Here's why: Identical twins. They start out as one fertilized egg (conception), but that egg doesn't divide until several days later."

Actually the DNA of twins is programed from when the cell is single to develop into two persons at conception. It isn't a random event for the cells to form two people as it grows, but is actually in the genetic blueprint from conception. The split occurs very early. There is no reason why the single cell can't have two souls at this point since it is set to develop that way as it grows. Think of it this way: the twins share the same cell in the same way that they later share the same womb.

I appreciate your thoughts on the subject. Don't get me wrong, I think abortion is murder. The point you make is interesting and worthy of more thought, but I'm not sure we can say a cell with a "genetic blueprint" possesses a soul. If so, then our bodies are full of millions of souls. Any one of our cells can be made to grow a new human, it doesn't need egg and sperm anymore. In some ways this level of the debate is starting to sound like the proverbial "How many angels can dance on the head of a pin?" arguments!