A_Future_Pilot: And if abortion=murder then it has nothing to do with simply a Christian thing, it has to do with society in general. Preventing murder is not imposing your belief system on someone else.
orcishgamer: I'm going to give you the benefit of the doubt and assume by "murder" you meant "killing another human being". Despite "thou shalt not kill" religious folks overwhelmingly support war and the Bible is chocked full of killing, including genocide of the Canaanites (actual children included).
Every mammal kills unwanted young, it's a survival strategy, we're able to do it pre-birth making it a bit more palatable. In the end the "is it a kid yet or not" argument is a red herring, nothing more. Killing is legal in many instances in modern society, even outside of war. Eliminating a zygote appears to be on the "it's okay" list. Sorry, if that bothers you but given what you support, if you're pro the Bible, go fucking pull that beam out of your eye, then come back and talk to me.
Actually, the Commandment pertaining to this is: "You shall not murder." Which number Commandment it is and, to some extent, how it is stated, depends on which translation of the Old Testament is consulted, however 'murder' is the generally accepted term, not 'kill'.
The difference is not only semantics. 'Murder' is always unjustified and illegal, but 'killing', as you yourself argue, is often justifiable and just as often legal.
Merriam-Webster defines them as (first definitions):
Murder:
to kill (a human being) unlawfully and with premeditated malice
Kill:
a : to deprive of life : cause the death of
b (1) : to slaughter (as a hog) for food (2) : to convert a food animal into (a kind of meat) by slaughtering
Some of the secondary and tertiary definitions are the same, but this is because they are close synonyms.
I am just mentioning this, because this is possibly the most misquoted Bible Commandment. Using the correct word here does clear up a lot of ambiguity, I think.
EDIT:
So, to me the argument really does hinge on whether or not the fetus has a soul, for I believe it is the soul that makes Man created in the image of God. If the fetus has a soul, then, in fact, abortion is murder and Christians are totally justified in being morally outraged. However, if the fetus has no soul, then abortion is merely tantamount to killing livestock and only vegans should object. This is why I made such a big deal about when, and if, a fetus has a soul.
EDIT2:
Please note that even if the Bible does state something definitive about a soul being granted at the moment of conception***, it doesn't mean that I am saying that abortion should be illegal. I am am only saying that if this is the case, then I fully understand why Christians would want to criminalize the practice. Christians get just as many votes per person as anyone else, and they must, as every else, vote their conscience. But, we have the First Amendment, and we have no state religion; just because a faith denounces a practice, it does not mean the country's laws must as well.
***A strong possibility. I have neither read the entire Bible nor do I have a perfect understanding or recollection of all that I have read of the Bible.