OK, just for the fun of it I'll play along.
All things fall into two sets: Things that have a belief in God and things that do not have a belief in God.
The latter, of course, would naturally contain all things with no beliefs at all -- like rocks.
"Weak atheist" is not a philosophical position, it's merely a descriptive term for all things without a belief in God. Now you may argue that this definition is so broad as to be practically useless, or you may argue that atheist does imply an epistemic position so would exclude non sentient things.
Fine. as Bunyip implied, as long as all parties understand each other's semantics there should be nothing impeding a productive discussion.
An American and a European can discuss the weather with no problem as long as they realise that one is using Fahrenheit and the other Celsius.