That is to say, there is no single moment when those got a definitive definition. There is human rights and yet we have not a single definition of what human mean. I still recall reading discussions if a dead person has human rights or not, which implies some amount of uncertainty that goes beyond even life itself.
Calling people idiotic is never the right move and it does rub people in the wrong way, but I disagree to the claim that you need to have all the answers. I do not have a encompassing scientific and philosophical answer when human life start, what makes it human, and when it ends, but I still perceive human rights to be essential and those who object to human rights to be fundamentally wrong. If the discussion is to be moved forward I feel like demanding answers to those question will just lead into an impassable domain.
There is an argument that conception is the cutoff. But on the other hand, the relationship of mother and fetus is rather unique. So arguably she can evict a fetus, whenever she wishes. After all, there is otherwise no obligation for one person to save the life of another.
So anyway, it's not just about religion.
But religion played and still plays a large role in forming these discussions because of its supposedly unique position as a "moral compass" for many cultures over the course of history.
Imho this is especially evident if you take a look cloning and stem-cell research in general. While most of the West is still busy trying to figure out how to make it compatible with Christian ideals of life, China, in their usual pragmatism, just goes ahead and does it because they don't have a comparable lobby stopping them from doing it.
In that regard, it is pretty much religion that put a stop sign there and even tho this debate is anything but new, I'm not really sure we've actually progressed at all with said debate, it rather feels like decades of stalemate.
A mother 'evicting' a fetus at 24 weeks without the abortion would result in a very tiny, but likely healthy baby (at least in the US, where premature baby care is generally outstanding). Source - held one in my hands this fall when our friends adopted him.
I'm not religious at all but it seems to me that, at least tangentially, most religious believes are rooted in philosophical unknowns and feeling of uncertainty. Religious people then resort to their faith of choice as a way to find answers.
Then again, since, as you say, being against abortion for religious reasons is idiotic, do we have an all encompassing scientific and philosophical answer about when, why and how it is "not idiotic" to perform an abortion?
If we don't, because as far as I know we don't, then why is it idiotic to decide based on your inability to understand a situation for which other people do not have answers?
As I said, I'm not religious and agree that religion is certainly not the only compass some people should lead their lives by. Nevertheless, your remark rubbed me the wrong way. "Idiotic," how can you be so judgmental if you to don't have answers to all the questions I listed above?