Do you feel the need for atheist-supporting orgs?
Not me, no. As @dimllaishebiaith says, atheism isn't a belief system with a religion-like structure. I once looked into Humanism but it's too church-like for me; I just don't feel any need for organisation of my non-belief.
I can see there might be a need for something in a more religious society, which expected everyone to profess a faith of some sort. That said, I'm nominally CofE - not baptised or anything, it's just the English default when required. As I don't believe any of it, I'm content to muddle along with formal religions when it suits me to.
In America there's a Church of Satan and a Church of Women, neither of which follow any religion. They have to declare a philosophy and a foundational text in order to be registered, so they did that, but without 'faith'. Last I looked, both were getting overwhelmed by members treating them as actual religions ... life is hard for an American atheist 'church' 😂
Agree with you about Humanist hypocrisy.