The title of the thread is not an honest question based on innocent curiosity and a desire to learn, but instead it is cocked, loaded, and ready to fire! Because it contains the word “weak”, a word that is neither quantifiable nor from any legitimate philosophical source, it is an attack. This is typical of extremists when they want to attack the moderate middle, whether it is phrased “you’re either with us, or against us”, “its either us or them”, or a myriad of other bifurcated attacks, or loaded wordings like the title, these are not actually questions, and so there is no polite obligation to respond to them. So I won’t.
Agnostics basically are the moderates, they are the doubters, they restrain belief about religions and gods and restrain assertions about them. It was coined by Thomas Henry Huxley, and is based on the Greek word gnosis, which refers to knowledge. In practice they can live as an atheist, meaning live without attending church, nor praying, joining the CFI, etc.
Atheist is a small word with vague meaning, and so it is easy to flex it to include many attitudes. Its basic construction is “not” “theist”, that leaves a whole lot of possibilities open, but doesn’t assert any one of them. There are moderate and extreme atheists, both are here on this forum. The extreme ones want to fight and end religion.
I’m on the agnostic side, when the religious make an assertion about this or that god without evidence, then I don’t know what to think about the god. When the atheists make an assertion about this or that god without evidence, then I don’t know what to think about the god. I hear that to know something about the god of Abraham, first you have to die. So instead of pursuing knowledge about gods, I’ll just pursue some evidenced knowledge instead and won’t worry too much about the holy assertions.
This being the CFI, Humanism deserves to be mentioned too. Humanism is a rich and diverse set of ideas that promote monism, naturalism, skepticism, education, empiricism, and yes there is even a belief in there, speculative belief that to achieve a good future we can look to and depend on humanity to create it, without the assistance of any gods. I recommend Corliss Lamont’s work, if one really wants to understand Humanism.