Because no one has ever died in the name of religion before...right?
I'm willing to go on record and say that in an easy majority of cases, when someone died in the NAME of religion, it's a case of identity theft. Political and economic reasons motivate a lot of "religious" causes. Also, a number of religious people who are against the taking of life ARE against the instances where religion has played a role in life-taking in the past.
Similarly, there are people who have died in the NAME of non-religious ethical ideals such as "freedom" or "democracy" without contributing to real freedom or acting in ways that real principles of freedom would condone. There are people who have been killed in the NAME of freedom as well.
Anyway, I'm a Christian whose belief on abortion is that the issue is clearly so complex that I couldn't possibly presume to tell someone else what they have to think about it. I know a lot of Christians who are politically liberal or politically moderate. It so happens that the conservatives have managed to get the NAME "Christian" associated with conservative christianity and evangelicalism in the US media.
I bet I can find you a crazy pro-life atheist, I bet I can find you a crazy pro-life Christian, I bet I can find you a crazy pro-choice atheist or Christian, and I'm sure I can find you thoughtful people with well-reasoned beliefs on any side.
Every so often, one of these "real world" threads on QCDN winds up hitting on a topic that has a public religious face. I have yet to see one where a public religious face states ANY view that EVERY religious person would ascribe to, and it's only the VERY rare atheist/agnostic poster that recognizes religion as being a multifaceted category. Religion-bashing becomes a pasttime for a while, and then people move on. It's annoying to those of us who actually think through our ethical sensibilities and responsibilities and happen to find various religious narratives meaningful, though, and I wish people would make fewer blanket statements. Religion isn't a binary category; neither is Christianity.