I frequently hear atheists -- and I want to stress frequently -- claim that you can't be a thinking atheist and also against abortion. The rationale is analogous to homophobia. You can't be both a thinking atheist and against homosexuality because homophobia is solely a consequence of religion. The same claim is made about abortion: the arguments against abortion are religious in nature. To put it more precisely, there is no secular, rational basis for opposition to abortion.
As an atheist who was opposed to abortion up until this year, I must reject this when I hear it. Even when I do, though, I'm told I'm wrong and that it's still something kept from religion.
I have had several readers ask me for a further account of my transition from anti-abortion to pro-abortion (both legally and morally). Rather than giving dry details about the arguments which I was once persuaded by and later arguments which dissuaded me from my former conclusion, I thought I'd try something more interesting.
Is there any atheist who would be interested in doing a debate via blog on abortion? I'm not sure if there is something already out there of this nature, but I thought it would be a good opportunity to show that there are secular arguments against abortion. Even though I no longer hold these views (and it has been a while since I have pondered the philosophy around it), I will take the side of an anti-abortionist in this debate.
So, if there's anyone interested, let me know. The only qualification is you must be an atheist. You can be either pro-abortion or anti-abortion (either legally or morally), but you must take the pro-abortion side.