I just always find it strange the way that "100% athiests" seem to ignore the logical conundrum of "I don't need a God or theology to live a good life" when our constructed definition of "good" comes from religion.
On "good comes from religion"... you can start with the western classics (or eastern classics, but I do not know them) https://plato.stanford.edu/entries/plato-ethics/ https://plato.stanford.edu/entries/aristotle-ethics/
Then maybe take a course or two on Ethics https://ocw.mit.edu/courses/linguistics-and-philosophy/24-23...
Then explore from there.
You can spend a few weekends or a lifetime on this if you'd like, and either way it will be worth the time.
To elaborate,
> Most anthiests seem to be nihilists
Not true
> they're already (claiming to be) doing that
No, they're not
> the logical conundrum of "I don't need a God or theology to live a good life"
There's no conundrum or contradiction here, plenty of us live good lives
> our constructed definition of "good" comes from religion
Sounds like a made-up fact. I don't need an omnipotent third party to validate that taking another person's life, or stealing from them, etc. is not right. Empathy and the idea of "do unto others" are quite easily understandable and relatable outside of the context of religion.
“The people that came up with <useful idea> also believed <useless idea>” does not imply that “To benefit from or further refine <useful idea>, one must also accept <useless idea>”.
(I don’t see religion as useless, but there is no reason people who do would have any problem adapting and refining moral ideas first developed in a religious context, any more than religious people do for ideas developed in different religious contexts than their own.)
I believe the main characteristic that takes apart atheist from other belief systems is that ultimately without a god that objectively defines what is good, one must define by himself what is good. This one one side is liberating because there is no more pressure between what one thinks is right and what the religion tell them, but at the same time extremely difficult because one exposes themself to all their psychological weaknesses (and to whom can manipulate them).
I am wondering what makes you think that?