I suspect Thomas Henry Huxley open_in_new didn't like thinking he was an atheist, so that crafty devil found a paradoxical way to say the same thing: agnostic.
OMG.
Both words have the prefix "a", meaning "without". Then, "gnostic" refers to knowledge of whether god exists, while "theist" refers to belief in god.*
Agnostic: Without knowledge of whether god exists.
Atheist: Without belief in god.
So, if someone asks "Does god exist?", & my answer is "I don't know.", then I'm probably agnostic...
& also atheist.
If I don't know whether god exists, then I can't also actively believe in him.
Example: If I don't know whether I have a parachute on my back, will I jump out of a plane? Not if I have a will to live! Because I don't actively believe I have a parachute.
Would that mean they might be... ...atheists?
🙈 🙉 🙊
Epistemological mischief...
Just identify however seems right to you, believe what you please, & as long as you're not harming anyone, don't let me nor anyone else tell you what to do nor who you are!