In principle, atheists don't proactively apply their beliefs to others - there's really no way to do so - unless and until someone raises the subject of God. How would that go? Atheist, in a vacuum: "God didn't do that!" Anyone else: "Did anyone say he did?" No, it starts with "God did that." It's not like people who don't believe in unicorns go around wanting to talk about unicorns not existing. It only occurs when someone else starts in about unicorns existing. There are nigh-infinite number of things any one might not believe in, they would spend their whole lives trying to talk about things that they don't think exist. So atheism is not equivalent to theism.