"This belief is not meaningfully comparable with the belief that the sun will rise tomorrow morning.... It is possible you see to provide an argument in favour of one of those beliefs, the second is simply a concept you hold very dear."
It's funny you say that. We had an argument on exactly the point of whether you could support the concept that the sun will rise tomorrow, and you ended by saying that you had no problem with the fact that you accepted it completely without support or argument, as a bare assertion. I can find you the quote if you want. It was quite striking, and I promised at the time to bring it up again if need be. I didn't know you'd provide me with such an incredible opening, though.
So no, _you_ actually can't distinguish these kinds of beliefs.
"I can make the argument that killing a living, self aware, sapient and sentient human being is removing his agency, presumably against his will."
Sure, but what if I reject that that matters? What if I just don't believe that agency is a relative criterion or that morals exist? Why can you impose your belief to the contrary on me? I'd love to hear your argument in favor of the fact that they do, and that you're "morally justified" in enforcing that on me.
"Can you similarly justify your belief that personhood begins at conception, in a way that is satisfying to someone who does not share your religious beliefs."
Can you provide an argument to somebody who does not share your moral beliefs (or believe in morality at all)?
The fact is, if I believe that fetuses are humans and killing them is murder, I _am_ going to fight to end it. That's a descriptive fact. Just as you would fight to end murder, being not as twisted as many, who would argue that it is not wrong.
As a side point, to "But seeing as that is your own personal belief, you do not get to impose that on other people, however difficult that may be for you,"
I would have to wonder who made you king? As always in a democracy, I can fight to impose whatever I want to, including fighting to change the Constitution or the courts until they allow me. I'm not sure what sense of "can't" you even meant, actually. "Can't" consistently in your moral system? Why are you trying to impose it on me?
So,
"once again you make a completely ridiculous argument."
No, I don't. I just realize, as you will not admit (to yourself or others), that my world view inevitably shapes my moral beliefs, and my moral beliefs inevitably shape my view of the law. And not only me, everybody else is the same.