It is a womans body to do what she wants with it. (staff edit)QUOTE]
I think this is a key issue that needs to be determined.
If the unborn child counts as a living being in and of itself, then abortion is morally equivalent to murder. If the unborn child doesn't count as a living thing in and of itself then abortion is morally equivalent to appendectomy.
So the key question has to be whether the unborn child counts as a living being and whether, Scripturally speaking, it has a value.
Lots of arguments abound referring to how Jeremiah was "called before he was born" and how God "knit me in my mother's womb" but none of those really address the issue. When God made Adam there was a time when Adam was made by God, man-sized and man-shaped, but not living - he didn't live until God breathed life into him. So we need something more than "God formed me in my mother's womb" to determine whether the unborn is a living thing or not and what, if any, value Scripture places on an unborn child.
It took me some time to figure whether the Bible actually speaks of abortion in any meaningful way until a friend pointed me towards some verses in the OT that suggests God values the life of an unborn as being of comparable value to someone who has been born.
Exo 21:22-25 NKJV "If men fight, and hurt a woman with child, so that she gives birth prematurely, yet no harm follows, he shall surely be punished accordingly as the woman's husband imposes on him; and he shall pay as the judges determine. (23) But if any harm follows, then you shall give life for life, (24) eye for eye, tooth for tooth, hand for hand, foot for foot, (25) burn for burn, wound for wound, stripe for stripe.
On the basis of this passage I can't help but think that God assigns the same value to a child before birth as after birth. Although we don't execute people for cursing their parents (as required by Exo 21:17) I don't see how we can escape God assigning value to the unborn child in 21:22-25. We can see that no longer executing some people as required by OT law means we assign a higher value to life now than then, and it's hard to see God putting a value on the unborn in OT times only to figure that under the new covenant the unborn are "just a bunch of cells" and what was once valued as equivalent to a living human is now regarded as just an annoyance to get rid of at will.