There are a few good studies that may help us figure out what to do about abortion. In a recent study, researchers at the Guttmacher Institute and the World Health Organization found that making abortion legal neither increases nor decreases abortion rates.
In another study, researchers at the Washington University School of Medicine found that making birth control widely available did reduce the abortion rate by 62–78%.
The aforementioned Guttmacher/WHO study echoed those findings.
In a 2006 study, WHO researchers estimated the number of maternal deaths worldwide from women obtaining illegal abortions to be 68,000. Millions more women, they say, have complications, many for the rest of their lives.
To me, these studies are sufficient to direct us in forming reproduction-related policy. However, I recognize that a lot of people are uncomfortable with abortion based on religious beliefs. The contention of people basing their opinion of abortion on the Bible seems generally to be that a fertilized egg has the same status as a person. If a zygote is a person, then the commandment to not kill must surely apply.
The closest thing in the Bible that I can find related to abortion is a passage from Exodus 21, verses 22-25. Here is the direct quote from Jehovah from the New Jerusalem Bible used on Catholic.org:
If people, when brawling, hurt a pregnant woman and she suffers a miscarriage but no further harm is done, the person responsible will pay compensation as fixed by the woman’s master, paying as much as the judges decide. If further harm is done, however, you will award life for life, eye for eye, tooth for tooth, hand for hand, foot for foot, burn for burn, wound for wound, stroke for stroke.
No indication here is given of the stage of development. The fetus could have been 8 weeks along or 8 months along. To reiterate: if the fetus is killed, Jehovah demands a fine; if the mother is killed, Jehovah demands “life for life” or “wound for wound.” Jehovah clearly does not view a fetus at any stage of development as equal to a person.
The Exodus passage will probably seem familiar if you’ve ever looked at the Code of Hammurabi (the oldest known code of laws after the Code of Ur-Nammu): “If a man strike a free-born woman so that she lose her unborn child, he shall pay ten shekels for her loss. If the woman die, his daughter shall be put to death.”