That is precisely the fallacy I'm exposing here. Let me ask you, on the electromagnetic spectrum, where does "red" begin? It doesn't, because red falls along a continuum of electromagnetic wavelengths. Does that mean that there is no red? Of course not.
You (and the many others who fall for this fallacy) have not incorporated into your thinking the concept of continua.
Continua are everywhere in our everyday experience, especially in physics and biology. And yet, this fact is denied by statements such as yours.
So, individual human life does exist, but it does not start. That is the nature of the space-time continuum.
Sounds like my car.
The abortion debate is not framed around the concept of the continua. It is framed around the beginning & end of *human* life. Would you say that a human corpse is alive? If so, how is it alive? If not, when did it start living?
I think you're correct in saying that life is a continuum, but *human* life is not. The human body has a definite end to its life and has a definite beginning, although we aren't able to scientifically say when that beginning is.