There is no justification for taking the life of an unborn baby except in medical emergencies.
For someone who often speaks for the almighty you cannot give a direct answer (basically imo you are not an honest debator) but I accept/assume that you want to make all those illegal.
Now you asked what standard I would use to decide when abortion should be legal and when not. Here are some:
1. Realize that we do not necessarily need a very clear standard. Take the original 55 mph speed limit. We knew choosing say 90 mph would be dangerous. We also knew choosing say 25 mph though would save more lives but would create other problems. So 55 was chosen. It was a somewhat arbitrary number but it does not mean it was irrational. Same for abortion. We may choose 15 weeks or even 24 weeks as a cutoff point.
2. We know the woman is a human being. We know the fetus is a future human being and we know the further along the fetus resembles more to that future human being. We could try to balance the two and say if the woman is the victim of rape or incest she should normally be able to abort until say 24 weeks. Again somewhat arbitrary but not irrational.
3. We could say up until birth the fetus is not a human being because it does not have the independence needed to be a human being or that the woman cannot be compelled to house another entity in her body. Now that is very logical and precise cutoff point.
4. And here something for the other poster who claimed I do not ever give my opinion: consent to sex is not consent to pregnancy and even consent to pregnancy is not consent to maintaining that pregnancy or bringing it to term. Lack of consent on the part of the woman imo is crucial here.
5. We could use other humane and rational criteria: for example when the fetus feels pain. We can trust the medical field to tell us about that. Question: can the fetus be given pain medication so it would not feel pain?
So you are perhaps partly right that a precise point to decide between legal and illegal abortion might not be there in most cases but it does not mean the same is irrational.
The problem with your position is that you give zero weight to the humanity and independence of the woman. Your position in my opinion is irrational. Even if we stipule that even a pea sized fetus is a human bring with full rights equal to the woman at tte very least you should balance the right of both against each other but you do not. And depending on your religion imo is most irrational or at very least problematic since others might not share those religious views.
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