This is such a tricky one. I want to say 'conception' on the one hand, especially based on the Bible's reference to God knowing you before you were born and being wonderfully made, but I am not quite sure how to reconcile it with my pro-choice stance on abortion (which I understand is completely at odds with my own church's teachings).

I guess a soul is different from a life, if that makes sense, since a soul exists after death, no matter when that is.