A question about atheistic “beliefs” (opinions, guesses, etc.)

[downbeatplumb]

Yes you are. 
If you don't currently believe in a god you're an atheist whether you like it or not. You may be an agnostic atheist but agnosticism is a stance on knowledge, atheism is a stance on belief.

I am not an atheist. I realize counting people like me among your numbers would strengthen your group intelligence values, but we are not atheists.

Every atheist lacks a belief in gods, but not every person without a belief in god is an atheist. Some dictionaries indicate that is how the word is used, but some do not. Prior to the 1950's, just about EVERY dictionary had as its primary definition: Someone who denies the existence of gods. That certainly was the case during the days of Thomas Huxley...who wanted to separate himself from the atheists and espouse a more nuanced, logical stance.

Do you currently believe in a god?

if no then you are an atheist.

You see its binary, either you are a theist i.e .you believe in a god or you are an atheist because you don't. Those are your options and its true whether or not you self identify as an atheist or not.

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But, as someone once wrote, "An atheist is just an agnostic without the guts to acknowledge he/she is." (Or was it the other way around?)

Agnostics are a sub branch of atheist.

Like Catholic is a sub branch of christianity.