Atheism is the lack of that belief. You can be an atheist and simply lack belief, or you can affirmatively claim that no gods exist.
Many atheists are somewhat in the middle: for example, there are certain god claims that are so patently ridiculous (e.g. Xenu) that I do claim that they don’t exist, whereas there are others that are probably unfalsifiable (e.g. a deistic god) and so I don’t think it’s possible to make a legitimate claim that they don’t exist.
Agnosticism deals with knowledge, not belief. It’s right there in the word: “gnostos” is the Greek word for knowledge.
Theism is the belief in a god or gods.
Atheism is the lack of that belief. You can be an atheist and simply lack belief, or you can affirmatively claim that no gods exist.
Many atheists are somewhat in the middle: for example, there are certain god claims that are so patently ridiculous (e.g. Xenu) that I do claim that they don’t exist, whereas there are others that are probably unfalsifiable (e.g. a deistic god) and so I don’t think it’s possible to make a legitimate claim that they don’t exist.
Agnosticism deals with knowledge, not belief. It’s right there in the word: “gnostos” is the Greek word for knowledge.