At the risk of provoking wrath and losing whatever popularity points I may or may not have, I will say that since I have converted over a year ago I have not understood the total opposition to abortion. When I came into the faith I did not see the vast majority of abortions (i.e. the earlier ones) as killing anyone at all, let alone murder. To be honest, I have yet to be persuaded it's murder (and therefore wrong). I am putting that out there not so much that I think anyone is obligated to convince me, but at least to express my honest consternation about this in the hopes maybe it will aid understanding the other side here.
I think all of us are aware that one of the 10 Commandments is "Thou Shalt Not Kill." We know this means we are not to kill innocent people. This cannot mean killing during a time of war, or execution of a murderer, because the same law that said we cannot kill allows for killing during war and demands murderers be put to death. The question must then be asked, is an unborn baby a human being in the sight of God? Clearly they are.
One scripture I always go to in order to show this point is found in Luke 1:41. Mary had just visited Elisabeth and told her that she was chosen to bear the Christ child. Elisabeth was pregnant with John the Baptist. In the eyes of the pro-choice crowd, John was only a blob of tissue, not fully human. He was but a fetus, a zygote, and without any legal protections. Notice how he is described?
And it came to pass, that, when Elisabeth heard the salutation of Mary, the babe leaped in her womb, and Elisabeth was filled with the Holy Ghost.
Next, you can turn to Jeremiah chapter 1. God speaking to the prophet says the following in verse 5.
Before I formed thee in the belly, I knew thee; and before thou camest forth out of the womb I sanctified thee, and I ordained thee a prophet unto the nations.
Obviously, God didn't see Jeremiah as a fetus while he was in the womb, but he knew him by name, and as a prophet to the nations. Next, turn over to Genesis chapter 25. Rebekah became pregnant, and notice what it says in verses 22 and 23. Again remember, she was only pregnant. The pro-choice people would say she had a fetus, or in this case, 2 fetuses in her womb, with no legal protections, and they would defend her right to abort.
And the children struggled together within her, and she said, If it be so, why am I thus? And she went to enquire of the LORD. And the LORD said unto her, Two nations are in thy womb, and two manner of people shall be separated from thy bowels, and the one people shall be stronger than the other people, and the elder shall serve the younger.
Again, God calls what pro-choicers call a fetus, children. If this is not enough, I would suggest you do a search for pictures of aborted fetuses in the first trimester. You won't find pictures of tissue, but you will find body parts: arms, legs, hands, feet, and a head.
The thing about this story is, it says "white mainline protestants" are the least likely to find abortion immoral, while "white evangelical protestants" are the most likely to find abortion immoral. What is the difference between these two groups? Evangelicals are those who believe in the innerancy of scripture, and actually believe what God says. Mainline protestants are those who believe in God, but deny the innerancy of scripture. They are people that generally go by their own feelings, rather than scripture, in deciding what is right and what is wrong?