Here is one, simple way to express the central argument in the abortion debate:
Killing an innocent person
The unborn is an innocent person from conception
Therefore, it is wrong to kill the unborn
The conclusion of this argument expresses a moral judgement. Which of the premises is a moral statement and why? which is a nonmoral statement and why? The crux of the debate focuses on the second premise. What, in particular, is at issue for both the conservative and the liberal view?