Yes it is. I have only expanded on the dictionary definition.
From Wikipedia:
"Atheism, in a broad sense, is the rejection of belief in the existence of deities."
First, this implies that someone has had a mental process that lead to reject the idea of gods. I don't think a 2 year old has that capacity.
Second, there must be a consistency in this rejection.
In your previous thread I tried to understand your position and you did not bother to give me a substantive reply. But I will try again
In this thread you proposed a hypothesis that there might be something which atheists have in common and which they do not share with theists. You very properly acknowledged that this would not be a perfect match and that if it were true it would only be saying something about the average. Later it seemed that you were founding on the premise that theism is a biological trait. You also listed a number of possible commonalities which many people would see as positive; and in doing both of those things it seems to me you sought to distance yourself from those theists who characterise atheists as amoral or immoral and all of that negative stuff we hear about as typical views in some parts of the united states.
What is the evidence for a biological basis for theism? I think you are proposing that it is possible to infer that from a high incidence of theism over many cultures. I often see that kind of reasoning, and I do not think it necessarily holds. In this instance what seems to me to be true is that most people accept the narrative they are given by their parents and their society.
You have pointed out that some people who describe themselves as atheists are not necessarily right. And you have also said that some people who describe themselves as catholic are not necessarily right. Think about that for a moment. If a person says they are catholic what does it mean? In my experience it means that they identify with a particular cultural group, quite often: it is a form of tribalism. That is quite different from what the pope might think (though I suspect the pope is very well aware of the value of such tribalism) or what a catholic theologian might think: they might think that catholicism consists in a series of beliefs such as transubstantiation or the immaculate conception or whatever. But they are just plain wrong. Some catholics subscribe to those things and many do not. They don't reject them either: they just don't think about them at all. I have had met many catholics who take the view that if you are born a catholic you die a catholic and it really does not matter what happen in between. They don't go to church regularly: they don't confess regularly: they don't do any of the things conventionally supposed to indicate membership of the religion they say they espouse. But they support celtic football club: not rangers. They make sure their kids go to catholic schools: and they make sure the kids go to church so that they can participate properly in the tribe.
I am not so arrogant as to ignore what they say and I conclude that that is what it is to be a catholic: it is not something you
do: it is something you
are by your own lights and affirmation. At least for some that is the way it is, and there seems to be a great many of them. It boils down to group identification "we are the people who put dirty smudges on our heads on Ash Wednesday" etc is not about the practice of religion: the normal view of that practice (belief in god etc) is secondary to the tribal markers.
Everybody has a tribe of some kind, as FromDownUnder said. There is no difference between theists and non-theists in that sense. We may well be hard wired for that: I think we are, because we are a social species and so we need a group (several perhaps, organised into a hierarchy).
This is where I think some of the miscommuncation is coming from. You are trying to establish that atheism is a tribe. People are resisting that idea because that is not how they experience it. That is just a fact. A tribe exists where people identify themselves as part of it as a central tenet of their sense of identity. There are some atheists like that: the atheists in america appear to be embattled and some have formed tribal identity in face of that (maybe: I am not american and so I cannot be sure). That seems to be a fairly common response to prejudice or "otherness" when one cannot gain acceptance in the wider society: but it is the response of only some of the people and only in some circumstances
For me you appear to be doing what many theist do: you are assuming that the way you slice the world is inherently important. You further assume that since that is the case then everybody must grant that same importance to your tribe or category system that you do yourself. What some of the people here are trying to tell you is that you are wrong in that assumption
I do not
reject the notion of a god: I blandly assume there is no deity and I get on with my life because
it does not matter. Not. At. All. I enjoy thinking about various belief systems and also tribal groupings and what they lead people to do and say and think. But it is merely a discussion. It has nothing at all to do with the price of fish. I do not slice the world into religious and non-religious: theist or non-theist. It is not a construct that makes a difference in any way I find important. It is true that on Ash Wednesday I see people with dirty marks on their foreheads and I realise they identify as catholic: often that is how I find out. Does it make any difference to my views of those people? Not even slightly. It is wholly irrelevant to how I see the world.
You have chosen to presume that mass conversion in states where atheism has been imposed is significant: it isn't. Most of those people will espouse what seems good to them for a tribal identity, and in those instances it is perfectly possible that the wish to distance oneself from a political or economic ideology which doesn't suit can best be done by joining an "off the shelf" alternative which provides a ready made and well organised support group. That is quite likely in fact, if that which is rejected happens to be heavily collectivist: individualism is not valued everywhere in the way it is in the post enlightenment west. Indeed even there there is a will to the tribe as well as a will to the individual value of each person: that tension also seems to be widespread and the balance between those different values varies in different places and at different times. It may be that this is also hard-wired: I do not know
But the phenomenon you choose to see as a construct with theism at one end and atheism at the other does not strike me that way at all. What I see is is a construct with individualism at one end and tribalism at the other. I do not share that with all other atheists: I do not identify with them in that way.