Maeght,
You don't believe it but cannot say it doesn't exist - that is the point.
He knows that.
Is saying God doesn't exist the default position in your view?
You’re not getting it still. There’s a difference between the strict epistemic statement, “categorically X doesn’t exist” and the practical working statement, “we have no choice but to proceed
on the basis that X doesn’t exist, at least until we’re given a cogent reason to think otherwise”.
For practical purposes a-teapotists work on the basis that the orbiting teapot does not exist (pending evidence to the contrary) but cannot say categorically that it doesn’t. Same thing for a-theists and "God".
Russell’s teapot incidentally just illustrates the fallacy of “but you can’t disprove it” having anything to say to a claim’s truth value. Vlad is fond of the “but you can’t disprove it” line for example as if that makes a point of some kind, but denies it when it’s explained to him that he’s attempting the negative proof fallacy.