I think the term atheist is not applicable if it is suppose to mean something in the general sense in lacking faith. Even though atheists claim to simply refute an existence of god and thus are atheists the problem is two fold. Limits on human knowledge and the human senses and how we categorize god in different ways. God is about a good presence and therefore a faith in good can be categorized as a faith in something spiritual and super natural ( edit: defining super natural is also abstract and saying humans are inherently good due to some universal code implies a super natural theme. That is why in the general sense an atheist is confronted with making sense of the world and similarly will make leaps in judgement like a faithful person) Therefore community service in helping humans to improve is a faith that humans will benefit and are good, and is a kind of prayer.

Also the limits on the human senses means that humans will also have to believe to a certain degree on how their surroundings are working. So by default humans are not perfect atheists or people who only operate on facts. Since a blind person will never know how the world looks like and must trust others. So any human with limited senses is already less of an athiest than a person with eyes.

Is atheism just about lack of faith. Or about following only the facts. I already covered lack of faith.

However if it is only the facts, then the problem of limited senses should be an example. Also limited knowledge and having faith in our current knowledge being true ( things which are questionable) and having faith beyond it as well. Also humans are emotional which is another reason why humans can not be perfect atheists. Their emotions are irrational, their emotions demand more than just facts.

What is an atheist? There is no perfect example of atheism when looking at the human as the model to define atheism from.

You say they are atheist but they are spiritual people in tune with their emotions.