The zygote, then the embryo and then the fetus are full-fledged human beings
“Full fledged” is not a definition.
A parasite, or an organism that interacts with a host organism in a parasitic manner, is generally another species.
The word “
generally” is important. It shows that the biological definitions are descriptive and arbitrary. The parasitic relationship is a biological exploitation of one entity by another - whether of the same species or another. But let’s cut to the chase. Let me
grant all your arguments about full-fledged and fully human, and whatever else you bring up - at least for the time being. (Can’t be more accommodating than that.

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Even in that case the woman is under no obligation to share her bodily resources. If someone needs a blood or plasma transfusion in order to survive (and these are renewable bodily resources) that need does not present an obligation for someone else to provide those resources. If someone needs a kidney-transplant, no one can be forced to provide one, even though one can live with one kidney only.
Our whole legal system accepts that we are the sole owners of our body (I am aware that some Christians disagree - but here we are dealing with
secular arguments), and as long as this right in maintained by system, the zygote/fetus or even “baybee” cannot have claims to get those resources.
So no, while you wouldn’t call it fried chicken, it’d be a shame that it didn’t get enough time to develop and hatch.
Shame? What a strange concept in this relation. Is it a “shame” to eat fried eggs if the eggs were fertilized?
But let’s take another example, this time against the “full-fledged”. Consider a medical student, who has finished her studies, she is as qualified as she can be. Yet, she cannot practice medicine until she receives her diploma. This can be considered a “formal” declaration, but it is very important. Without a diploma she does not have the right to call herself “doctor”, cannot put a shingle above her door and cannot practice medicine.
Just one second before she gets that piece of paper she is a medical student and one second after she is a doctor. The paper does not add any new knowledge or ability… it simply adds a new label to her. But we do not want to allow any random person to get a scalpel in her right hand, a sick patient in the other… and allow her to “have at it”.
If you don’t think murder
once outside the womb is anyone’s private business and decision, based on all the scientific truth surrounding what the embryo and the fetus are, why don’t you find abortion squeamish or morally repugnant? That is my question.
Murder is a legal term. An execution is not a murder. Killing in self-defense is not a murder. Killing in a war is not a murder. If allowed by the legal system, abortion is not a murder.
Of course I am NOT
for abortions. I don’t know anyone who is pro-abortion. This term was coined by those who are anti-abortion as an emotional put-down. It would be much better if every child would be wanted and happily expected. If every parent would be able to raise that child in a decent environment. No woman gets pregnant JUST SO that she could undergo an abortion.
You know, all your arguments would carry much more weight, if you (the church in general) would strongly endorse the non-abortifacient preventive methods. This attitude that every sexual encounter must be “open” to procreation - even if there is no chance of it (missing uterus and ovaries?) is quite ridiculous. The point is that the people are required (by the church) to abandon their reasoning abilities, and PRETEND that conception is possible, even when it is not. Why should people
play “dumb”?
One of the most UNITIVE activities are sexual in nature. The church also emphasizes how important this aspect is. And then changes its tune, and proclaims that the unitive aspect is not important PER SE, it is only secondary to the procreative one. Never mind that most couples have only two or three children in their lives, and have thousands of sexual acts.
As for the “unreliability” of preventive methods, that argument does not even get off the ground if one dares to think “outside the box”. The most civilized methods (when both parties concentrate on the OTHER one) are simply non-procreative in nature. There is no selfishness involved when the partners are only concerned about the pleasure of the other one… knowing full well that their own turn comes as well. And the real pleasure comes from giving, not just receiving.
So, finishing up, there is no secular reason against non-procreative sex. The church should encourage it, and then the stance against abortion (which is shared by others) would stand on much stronger “legs”.