As for Atheism, I hear what you are saying but in my eyes...
Agnostic = Does not know. Will accept either way--God or No God when given proof.
Atheist = Without God, does not believe in God/Gods and does not require proof.
Thus, it is faith. If someone proclaims there is no God, that is faith plain and simple. Without proof, it is faith.
Agnostic claims that knowledge in the existence of a god(s) is unknown
Atheists claim not to believe in god(s)
I am an agnostic atheist. There is no
scientific evidence for god(s). Some people have
personal evidence for god(s), I don't. I can't judge people's personal evidence, I can only judge my own. Since I lack that evidence, I have no other option than not to believe in god(s)
"I believe in god" requires only personal evidence. No one has to scientifically prove to anyone else why he or she believes in god. This is the theism/atheism angle.
"God exists"/"God does not exist", requires scientific evidence. Since it should be a verifiable claim. This is the gnostic approach.