or that a person is ethical while not subscribing at the very least to the basic, most fundamental human rights.
I'm curious. What, exactly, are the "basic, most fundamental human rights"?
Uh, I dunno. Don't rape. Don't steal. I'm sure any sensible (sensible =/= misanthropic fucktard savage) can come up with a few the general population of the civilized world can agree on.
And what is ethical about each of them?
Because they imbued the essence of right and wrong by stating things that cannot be done to an individual? After all, ethics deals with the study of right or wrong.
source
Also, do you think that Christianity had anything to do with your list of "basic, fundamental human rights"?
No, I did not. But hey, don't let that stop you in the way of building a nice strawman (#whatthefuckiswrongwithyou)
Well, I didn't so...
do you concede the possibility that people who grew up in Muslim/Hindu/Taoist societies might define "basic, most fundamental human rights" differently than you?
I don't have to concede shit because to me it is a given. Someone in another culture might think it ok to chop a little girl's genitalia, but that doesn't mean that child's right to not be mutilated is not universal as in it-fucking-exists-whether-you-accept-it-or-not. You don't debate if 2+2 = 4, or that raping is bad even if there is an entire culture out there that rape people daily while chanting 2+2=5.
You are just simply looking for a strawman to fight and proclaim victory.
If not, why do you believe that these "basic, fundamental human rights" are universal in nature, but NOT recognized the world over as "basic, fundamental human rights"?
They are universal because they apply to all individuals regardless of age, gender, sexual preference, religion or lack thereof, political affiliation or lack thereof, and so on and so on. Just because a culture says "these rights don't apply to so and so" does not make them so. If that were the case, then we are forced to conclude that women, universally, have a fundamental right to be treated equal just because some cultures do not accept that as a fact.
Do you believe that different people might think different things are ethical?
I don't have to believe it. I know it. It doesn't matter. When you distill their differences, you find commonalities shared by the majority of cultures (don't rape, don't steal and so on.) And by "shared", I mean "acknowledge" in some way or another. That there is institutional violations of those rights (even in cultures that some type of written or verbal tradition of acknowledging them) is inconsequential. That is just breaking some form of law or having a subjective, partial application of some form of law.
That is the thing about a right that is universal to all humans. It means shit to its nature as a right if entire cultures decide to ignore it.