In UK atheists considred more moral than theists.

[Mister Agenda]

Not getting our morals from someone who claims to be a moral authority. But asking this about atheists is a category error, as they same question would be if asked of theists (you'll get different answers depending on what god they believe in). On this forum, most of the atheists are humanists, who use their brains to figure out what is most moral based on what has the best outcome for human thriving.

*emphasis mine*
Really?

on this forum:

Some atheists were defending a gay man buggering an under age boy.

Another atheist has stated there 5 people she'd like to kill if she knew she could get away with it.

Another atheist claimed if he lived back in the day, he'd happily participate in chattel slavery.

(I assume you disagree with the above?)

Clearly examples of why an individual's brain isn't capable of deciding what's moral.

So again, what is an atheists moral authority?

I assumed you understood what 'most' means. I should have known better. And given my assessment of your authenticity and genuineness, it seems likely that some or all of your examples are misrepresentations.