There is a continuing debate over what an atheist is. That this debate continues is baffling. I read about agnostics, hard atheists, soft atheists, militant atheists (Oh, my!), etc. The only reason I can imagine for carrying on these conversations (they are not debates) is they provide opportunities to disparage atheists. I will make this simple: there is a one question test to determine your status as an atheist. Here it is:
Question: Do you believe in the existence of a god or gods?
If you answer “no” then you are an atheist. If you answer “yes” then you are a theist of some stripe (there are literally thousands of variations).
If you answer “I do not know,” then you are an idiot. The answer “I do not know” applies to questions that one hasn’t considered in full or at all or cannot come to a conclusion based upon the evidence offered. This “question” is at the center of all organized religions and if you have had any contact with a religion at all, then you have considered this question. The few of us who have not had any contact with a religion are usual those raised by staunch atheists who deliberately didn’t teach their children about other people’s beliefs in their gods.
If you have addressed this question but decided that you will believe what everybody else believes, for whatever reasons, then you are an idiot.
If you have considered this question at length and still haven’t come to a conclusion, then you are also an idiot. Gods are supernatural beings, like fairies, unicorns, ghosts, zombies, etc. Do you have any evidence for the existence of any supernatural entity, any at all? If you do, please rush that information to researchers who have been looking for centuries for such evidence and found exactly zero.
If you are one of those who accepts the beauties of nature as evidence for the existence of your god, then you must accept that it is also evidence for the existence of all supernatural beings: unicorns, pixies, necromancers, and the rest, which puts you in a distinct minority … of idiots.
So, now that you know what characterizes atheists, can you tell me what they have in common?
If not, you have not been comprehending this as you have read it. Atheists do not believe in a god or gods. Other than that they have … nothing … else … in … common … except maybe exasperation with the people who deliberately do not understand that.