Agnosticism is the view that we cannot know whether or not gods exist. An agnostic can be theist or atheist; those are belief-based positions, not knowledge-based.
(...)Atheism is a lack of belief in gods. It includes the view that gods do not exist, but is not limited to that (see agnosticism). You don't have to actively disbelieve in something to not believe it exists.
I see you use the words atheism in a different way than I do.
To me:
1. Agnostics and atheists are different in their statements.
1.1. An atheist affirms that gods don’t exist.
1.2. An agnostic neither affirms that gods exist nor they don’t exist. Classical sceptics (agnostics) speak of “suspension of judgement”.
2. The difference lies on the linguistic level: to affirm or not to affirm an existential predicate. 2.1. This definition is indifferent to the reasons to affirm X.
3. My definition is the usual one in the philosophical academic world. You can see the two main encyclopaedias of philosophy on line: Stanford (
http://plato.stanford.edu/index.html ) or IEP (
http://www.iep.utm.edu/ ).
4. Regarding knowledge, I would distinguish between rational or irrational.
4.1. If an atheist presents some evidence of his beliefs, I call him rational atheist.
4.2. If an atheist doesn’t present any evidence of his belief (personal intuition, for example), I call him an irrational atheist.
4.3. It doesn’t matter if this evidence is sufficient or insufficient. This is another problem.
4.4. Theists can be also rationalists or irrationalists (fideists, usually).
For you:
5. Agnostics and atheists are different regarding their beliefs.
6. Both atheism and agnosticism coincide in the knowledge, but oppose in their beliefs.
6.1. Knowledge: They don’t know if gods exist.
6.2. But the agnostic- atheist believes that gods don’t exist
6.3. The agnostic-theist believes that a god exists at least.
7. Your definition stands on the difference between to know and to believe.
8. Your definition is common in many not academic forums.
9. The fact that my definition is usually used in the academic world doesn’t do it better or worse. That depends of the context.
10. But I have a question for you: There are atheists who affirm that they are able to know (have some evidence) that gods don’t exist (“rationalists” in my terminology). How do you do to distinguish them from those who don’t present any evidence and claim that they only believe that gods don’t exist?
10.1. Justification of the question: Most philosophers are rational atheists. We need a special cathegory for them.