Can Someone be Simply "An Agnostic?"

[Simon Moon]

Yes, a person can be 'just an agnostic'.

I (and most here) would disagree.

Atheist - someone who asserts deities do not exist

Nope.

Atheist - the lack of belief in gods. SOME atheists may assert that gods do not exist, but that is not atheism in general.

Agnostic - someone who asserts that the truth about such things is unknown or unknowable

This is a position that addresses what claims are unknown or unknowable. It does not address belief, which is what atheism/theism address.

Theist - someone who asserts deities exist

Not all theists make that assertion. Many do not claim to know, with absolute certainty, that a god exists.

A theist may claim they know god exists, an atheist may claim they know god does not exist, an agnostic may claim that such things are unknowable.

None of these, including the agnostic, has the reasonable authority to assume their position is universally true.

They can exist alone or in blends.

Belief is defined by cognitive scientists as - The psychological state in which one accepts a premise to be true.

Belief is a binary mental state. Either one accepts the premise that a god exists (believes), or they don't (atheism).

There is the set of of all people that accept the premise that a god exists to be true. These are theists.

Everyone else is an atheist.