get on topic!, the threadmaker didn't ask you when life starts... or why or anything like that... he/she asked " are you for or against abortion"
personally, i'd say religion has to do with 75% of it, and personal opinion, and ability to cope with guilt has to do with 25%.
science has nothing to do with if you are for or against abortions... personally, i blame you journeyman, sorry but science and when birth starts really has nothing to do with anything on this thread, i respect your opinions, but personaly i'd have to say you're wrong, you are going to completely disagree with me, and i'm not bashin you in any way, but honestly science is pointless. science is often wrong,
"science" states those who use cell phones have a 50% chance of getting tomers in their skull, i know so many people with cell phones without head tomers...
science is often wrong, perosnally i disregard most things stated... like "the big bang"... more like "big bull$h1t".
religion, and opinion is where its at.
and the truth is... it all depends on the circumstances. you cannot give an answer because there are some many variables...