I find this whole discussion irrelevant. I don't care when these people think a life begins. All I care about is when a fetus is old enough to experience suffering if aborted, and before that time, who gets to make the decision that an abortion will occur - the potential mother or the the church using the force of the state to compel its values on her against her will. Once you answer those questions, the abortion rights discussion is over for me.
Personally, I feel that any first term abortion is as cruelty free as cracking open and scrambling an egg. This is the same standard I would apply to methods of raising and slaughtering animals. The fact that the fetus is human entitles it to no more consideration than a lamb or chicken. Failure to elevate humanity above the other beasts such as comparing a human fetus to a chicken fetus will offend the religious as well, but their beliefs and standards are not mine, and I consider their outrage manufactured, since it is found almost exclusively with those that have been conditioned by religion. Natural outrage is across the board. When a man begging for his life is killed on the street by a cop with a knee on his neck, the world is outraged, not just the religious. They didn't get their opinion from sermons.
"Life begins at conception"
"Then you object to killing live chicken embryos?"
"No, only human life counts, because humans are special in God's eye and have souls."
"If I believed that, I might agree with you."