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Life is a continuum. A human life, i.e., a human organism, begins existence at conception. Or do you think that sperm cells spontaneously form human beings?

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Ahh yes... that little word "A". I've listed definitions above that I think will help this discussion tremendously. If you want to say "a human life" instead of "person", that's fine, but it's very confusing.

So, you agree that human life is a continuum. You are saying "a human life" begins at conception -- or "a person begins at conception". Can "a human life" not be a person? It seems that you are using the terms interchangeably.

So, let's just stick with "person" OK?

No, a sperm does not just spontaneously form a person. Neither does a fertilized egg. And neither does a pre-twin zygote. Nothing is spontaneous, actually. It all takes time. Fertilization included.