Some theists, usually out of desperation or through arrogant posturing try to push the argument that atheism is a belief. Of course, most four-year-old children can see through the twisted logic of deliberately confusing the word "belief" (in its generic sense) with "religious belief".
Atheism is purely and simply not having religious belief and is a neutral position in relation to religion. Unlike theism, there are no degrees of atheism although there may be different motivations for being an atheist ranging from ignorant hatred of religion through indifference to informed choice.
So what are the traits, "three Rs" that distinguish an informed, thinking atheist?
Reality: Atheists will normally accept what is known to exist rather than a contrived, wishful version.
Reason: This is the innate ability to evaluate a situation without being clouded by biased thought.
Responsibility: Atheists have the responsibility to advance civilisation and the human species in a positive way rather than solipsistic, hateful view of theists that everything we do for science, medicine, learning history, geology is fruitless in the light of the world ending.