Atheism is defined as not believing in and god or gods and that’s it. There is nothing fundamentally systematic about it in any way. Protestantism consists of a whole set of beliefs, doctrine and rules managed by a formal leadership. It is very much systematic (though even then arguably not
one system given the extensive diversity world-wide). As I said, atheism is the opposite of theism, not specific religions. Atheism is no more a system than theism is.
The trouble is a) it’s factually wrong and b) it’s typically used as a tool for generalised attacks, which happen to include me.
No, it’s like saying a cocktail is almost always a bar. Cocktails can be part of what makes a bar and can even be a core element of a bar but the cocktail alone is not itself a bar.
A guess is conscious, a belief is sub-conscious.
That’s what you believe.
If it is the case, you can demonstrate it by choosing to believe in God for a short period. Can you do that?