Instead, I want to point out the incredibly flawed logic that these people are using. By trying to define a person at conception, they are (by their own defenition) condemning up to 70% of all souls that ever come into existence to purgatory (or hell depending on what flavour of the 38,000 different sects of christianity they adhere to). Up to 70% you say? Yep:
It is estimated that up to half of all fertilized eggs die and are lost (aborted) spontaneously, usually before the woman knows she is pregnant. Among those women who know they are pregnant, the miscarriage rate is about 15-20%. Most miscarriages occur during the first 7 weeks of pregnancy.Now, to a rational person, this is how evolution deals with the whole tricky process of assembling a human being. Evolutionarially it's really a way to prevent gross malformations, and an endless parade of suffering. The first up to 50% of miscarriages are caused by chromosome problems that make it impossible for the baby to develop. Usually, these problems are unrelated to the mother or father's genes. The remaining 15-20% are caused by things such as hormone problems, infection, physical problems with the mother's reproductive organs, problems with the body's immune response, or serious body-wide diseases in the mother (such as uncontrolled diabetes) . Like I quipped, assembling another human being is tricky business, and evolution has developed these neat little tricks to keep the ones that are alive and functioning from prematurely expiring too often (and then we help with our medical technology).
Of course, to the vast majority of these people, evolution doesn't exist, everything is boiled down to "goddidit". In their worldview, since evolution doesn't exist, what causes up to 70% of all souls that are created to spontaniously abort? Well? I mean, smart people know about biology, genes, chromosones, hormones, and all that sciency stuff, but these people view the world through the lens of the supernatural. Since they can't really attribute something that is naturally spontaneous, it must be supernaturally spontaneous, i.e. god(s). They may argue that another supernatural entity is responsible (satan, santa, evil spirits, whatever), but then wouldn't the supposed good entity not imbue the soul until the other ones are through with their mischief? The good one is supposely omnipotent, omnicient, and omnibenevolent. Should be an easy solution there. But then, these fundamentalists who want to take away women's reproductive rights and domain over their own bodies are going to define a person at conception, thus pre-emting their god. Or, endorsing the wholesale condemnation of souls... I wonder what the Dope (I mean Pope, transposing a p and d is so easy) would say on the subject?
I would like to point out that the rights of women is an entirelly different discussion, and Austin Cline handles that one admirably.