Me Myself
Back to my username
Let me try to explain it another way.
There's this group of people. They are ignorant of some things. They are ignorant of a lot of things. But you want to make them ignorant of only one particular thing--god--in order to group them with "atheists."
That's not an objective definition, as a dictionary definition must be. It's actually subjective (see, there's "you" in there).
Everytng is subjective, we cant get out of that and still be called humans.
Saying they ate ignorant of a lot of things does not make them less ignorant of the specific thing we are talking about though.
For example, if someone does not no how to read or write and also ignores a lot of other things, they are still illiterate. They dont cease to be illiterate because reading and writting is not the only thing they ignore.
They can be illiterate atheists for example
"Atheist" does not mean "they are ONLY ignorant of the concept of god BUT THEY KNOW EVERYTHING ELSE"
"Atheist" means "they lack a belief in God". Whether they lack all other beliefs or they know absolutel everything except what has to do with god is completely irreleant for the definition.