> The same one that got us other human rights, like freedom of speech. It's called humanism. It's different from religions by not being made up.
Humanism is just as made up and non-falsifiable as any religion, and in some cases more so. If you autopsy a dead body, you won’t find either a soul nor any form of “human rights.”
At least religious traditions are often based on practical experience. For example, in Islam it’s considers a moral obligation to get married and have children. Leaving aside any supernatural basis for that moral dictate, it makes sense given that human societies have to raise a lot of kids simply to perpetuate themselves from generation to generation.
But what about the humanist idea that you have no such moral obligation, and that “child free” people are of equal value to society as people doing the labor of perpetuating society—because of some invisible “human dignity” and “right of self actualization.” That’s pulled straight out of thin air.
> But "immorality" is not binary, and abortion tends to be quite low on the scale.
Not true. Most muslim countries, for example, including the one I’m from, have more restrictive abortion laws than any U.S. state. India similarly has a quite restrictive abortion law (not one inherited from the British, but one of their own construction after an extensive process) from 1971 until its Supreme Court intervened in 2022.
To my knowledge, no major culture that isn’t formerly Christian has the western notion of an individual “right” to an abortion. Even in Asian countries that permit abortion, it’s viewed more in terms of a collective policy of reproductive control than an individual right. That fact is completely unsurprising: deciding when life begins is obviously a matter for the government. Only westerners are so pathologically individualistic as to think that social determination should be subject to overruling by individual morality.