Atheists, the death penalty and abortion...

[Esquilax]

You want to know how that's "inviting" a zygote in? You are aware that you have ovaries, right? Do I need to explain the rest?

By that logic, shouldn't the man be given responsibility for the resultant baby, since he has so many more sperm than the woman does eggs?

Besides, knowing the risks of a thing doesn't mean you're necessarily accepting of each and every consequence of doing it; driving a car means you're more likely to be in a car accident but that doesn't mean you want to be, nor that every car accident that you're in is your fault. Going out in a short skirt might increase your chances of being raped, but that absolutely does not mean that you wanted it. I could keep going.

Still comparing an individual human life to other non-human species?

Well... yes, unless you can mount a convincing argument that the zygote is somehow above all other forms of life that we consider it acceptable to kill? And just stating that it's a human doesn't really count, and I've stated why earlier on.

Yes, well you should know that there are parts of the world that practices murder, rape etc. on a daily basis. I guess you think it's fine since their "intuitive and moral boundaries" allows them to do that.

Well, first of all I'd like to ask what parts of the world you think allow rape and murder on a daily basis, because I guarantee you that such a society would collapse in on itself pretty quickly.

But also, I'd like to point out that we're allowed to subscribe to a degree of cultural morality without losing our ability to draw lines entirely. Murder and rape are demonstrably harmful, and we have this magic ability called "empathy," which allows us to understand why those things are immoral.

Honestly, do you really think that the only thing that lets us know that rape and murder are bad is the bible? Is that seriously what you think?