It's not about belief for them. It's about knowing or not knowing. It's about distinguishing the knowable from the unknowable. It's about observable facts rooted in solid ground.
Something many theists fail miserably at or in a few instances are not beholden solely to this.
The truth is out...
I'm sure that's not what 99.99% of atheists believe. So, maybe there is an atheist that's mislead enough to believe it. "An atheist " as in one atheist.
I just took the beliefnet quiz and it said I closely match with Unitarian Universalism. I dunno much about them. So maybe none or maybe, like as been mentioned, a blend of Buddhism, paganism and nature veneration.
All you had to say was "Australian" and I am so glad to meet you. I'll probably take a bike trip to Australia, or Europe soon. Can't make up my mind which one. Either seems like a good idea.
Anyway. Welcome to the forum! Blessings and hope you enjoy your stay with us.