What galls me most (or is at least in the top 5) about the "abortion is murder - which means any action I take to prevent it is 100% justified" crowd is the pointing to the Bible as justification for their position.

If you make the leap that abortion equals murder, I get the point.

However, the Bible is actually pretty clear that until the fetus has been born, it's not a person and no murder has been committed. Any verses that talk about the unborn talk in terms of property, not human life - so you'll need to come up with a different source to justify your (rather extreme) position...