But you need to realize that most people dont share your religious beliefs. Accepting that a zygot is a full blown human being with a "Soul" is based on the teachings of your Church.. I happen to share that belief. But it is completely based on a religious formulation.
Americans are very touchy about having a Religious doctrine imposed upon them. So threatening people who disagree with your faith based idea's is pretty much a non starter as we have witnessed by the complete failure of the Pro Life Movement to get abortion made illegal or even to curb the number of abortions..
The hard thing about this thread is that we are going between what should be "law/worldly punishment", and the "religious issue".
Strictly speaking religiously, we should pray for those who commit murder (abortion or otherwise). If they do approach Christianity in repentance, accept them as brothers or sisters.
Speaking in "law/worldly ways" Laws will never matter in a countries without faith. Turtle eggs are more protected than unborn human beings here.
Through faith we should educate anybody wherever we live about abortion. We should open up many alternatives to abortion. We should seek Christian Doctors/midwives willing to perform the birth for free, Christian lawyers to do adoption papers for free, and parents willing to raise an otherwise aborted child as their own.
I know most of you here, including me, would be willing to accept an otherwise "going to be aborted child" into your home - or at least would help a local community private funded orphanage either by labor or financial.
There are ways around abortion. I look for options to prevent murder. Options for young / unmarried / scared / poor women to be able to turn to without judgment or hassle. Anyway, I would love to see every branch of Christianity UNITE against abortion. Though doctrine is different (yes dogmas too) most are opposed to abortion and would do a lot to prevent murder. Many would be happy to work along side EO's, RC's, OO's, Protestants, Anabaptists, Messianics., etc., in order to stop abortion.