Atheists, the death penalty and abortion...

[Esquilax]

So then, do you agree that a zygot/embryo is an individual human lifeform that starts at conception? IOW, is conception the start of life or not? (you claimed "no" earlier)

It depends on how you're defining it, really. The embryo would be cellular life, but that doesn't tell us anything useful, because the sperm and the egg that originally conceived it were that too.

Even if we restrict ourselves to human life, we still have two definitions that work. The body starts being alive at a certain point, before the actual person that will inhabit it begins to exist, really. But even that body is still growing into its human characteristics, having more in common with fish than humans at certain stages, like Kichi pointed out earlier.

So... no, I'd say that human life doesn't begin at conception, even if life itself does by certain metrics. It's the kind of topic that really does need specificity.