There are a lot of religious arguments (and general political ones) against abortion. But I think that the argument, generally speaking, demonstrates the scientific illiteracy of the everyman.
So you're against abortion for whatever reason, but consider this argument from Neil DeGrasse Tyson:
"Most abortions are spontaneous and happen naturally within the human body. Most women who have such an abortion never know it because it happens within the first month. It is very, very common. So in fact the biggest abortionist, if god is responsible for what goes on in your body, is god."
Now when he says 'very common' what he means is 50-70%. That's 50-70% of all pregnancies end in a spontaneous abortion that you 1) can't control and 2) are never aware of.
So how is the anti-abortionist stance tenable given this dataset?