I see your point. Its a very good point although I make a distinction between catholic ideas and Roman Catholic dogmas.That definitely is an argument against Bible literiam but then again it also makes me think of the literalism of catholic dogma where some of the more dogmatic adherents don't allow use of condoms or birth control. Religions that have such views consider abortion murder, yet god/nature is allowed to have much higher rates of death. I see little difference in natures horrible birth rates and humans contributing to that horrible stat.
My opinion about the Biblical: If abortion could be murder it could not be in a Biblical sense, because the child has not yet breathed or been taught either. The Bible does not give absolute distinctions about where life begins but instead puts value on the life of some ineffable quality held in the community and then the individual relative to that. The reason killing a man is wrong is that the man is made in God's image, however a man who has murdered is killed. (Genesis 9) The murderer is not in God's image, or it could not be killed. Moses was not killed as a child, because they could see his value. The Christian who participates in Christ is more alive than one who does not. The Jew who keeps the Torah is blessed, but the one who does not is cut off. There is no Biblical way to condemn abortion except under strictly reproductive interests. Calling it 'Murder' is an unbiblical thing, something projected onto the Bible and wishful thinking.