A priest told me that the church doesn't necessarily teach that life begins at conception, but rather that because we don't know when life begins, we must act as if it did begin at conception "in case". He cites identical twins as an argument for this (does the original embryo have two souls before it splits, or can reproduction take place outside of the sexual act in this sense?)
In attempting to refute this argument, I found the "Declaration on Procured Abortoins" released by the CDF. (available at http://www.priestsforlife.org/magist...ortu.htm#notes
In footnote #19, it states:
This declaration expressly leaves aside the question of the moment when the spiritual soul is infused. There is not a unanimous tradition on this point and authors are as yet in disagreement. ...
supposing a later animation, there is still nothing less than a human life, preparing for and calling for a soul in which the nature received from parents is completed;
Does that mean that the embryo may not have a soul at the moment of conception, but it is still considered Human Life, without a soul, regardless?