I know it's probably there for fun, but...
I don't think that physical facts like global warming, or biological evolution, are beliefs. More or less it would like,
"I've accepted it/them on the grounds of supportive data/evidence".
As such the GW, or Darwinism
(often misused as a replacement for the modern synthesis), entries do not belong. There is no such thing as a
'Darwin' philosophy.
Atheism as a category is just fine.... Why wouldn't it be?
Science (or the underlying method) would encompass the GW/evolutionary issues.
So... that would be a totally separate entry. Atheism, and science, are NOT one and the same.