Yes, it is.That is not at all inconsistent.
A single cell is not a multicellular organism. That is about as definitively true as it's possible to get. Therefore, the life of a multicellular organism like a human being does not begin at the point it is a single cell because at that point it is not a multicellular organism at all. Claiming that a human life begins at the point of conception is no more coherent than claiming that a human life begins at the point of intercourse or at the point of implantation or any of the other thousands of things that typically need to happen in order for humans to reproduce.
Nothing magical or special happens at the point of conception. A sperm encounters an ovum. An organelle within the sperm releases acidic enzymes which weaken the cell membrane of the ovum allowing the head of the sperm to penetrate said membrane. The plasma membrane of the sperm breaks down and is absorbed into that of the ovum along with the nucleus. The result is a cell with two nuclei containing two separate sets of DNA. At what exact point in that process does a human life begin? At what point does the soul come into existence?
Also, I still need to know about those monozygotic twins..
Define human.Are those things human?
Again, do you think there is a clear and objective distinction between human and non-human organisms? That distinction only exists at this point in time because the intermediate stages are extinct. So what exactly is it that makes humans human? When did this uniquely human quality first appear?
Remember, I'm only asking questions you claim to know the answer to. I do not mind if you believe that abortion is a sin or even that personhood begins at conception (even if I think the latter is incredibly stupid). That disagreement might be the basis for some fun ethical discussion. But you are claiming to possess actual knowledge of reality to which you think everyone else should be forced to conform. You are asking to be held to a much, much higher standard.
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