Itโs the same thing really, but without the โnegativeโ connotations usually attributed to atheism or atheists.
Atheists and Agnostics would obviously disagree. There's a core philosophical difference between being convinced in the negative and being unconvinced in the affirmative.
That said, what are the consequences of being a Theist, an Atheist, or an Agnostic? I might argue that Theists and Atheists have history of leveraging their confidence into an active policy of discrimination and bigotry. Whether you're a Chinese Communist cracking down on under-18 church attendance or an Israeli Zionist conducting a pogrom against Palestinians, there's a habit of imbuing your personal beliefs with political teeth.
โSee, Iโm not really an atheist but agnostic. It means Iโm not to be expelled from this community as a hereticโ
The flip side of this being, "I'm not expelling you from the community for excessive display of religious ferver".
It's easier to sympathize with avowed Atheists in nations where atheism is a disenfranchised minority. But as soon as you give someone like Christopher Hitchens or Sam Harris an ounce of political capital, they start cheer leading a genocide.
That, I think, is a real tangible difference. Agnostics tend not to begrudge other ideologies in the same way.
