The difference is actually ginormous!Since it can not be proven there is no God any more than it can not be proven there is a God, it would take no less faith to believe there is no God than it would take to believe there is a God.
Without faith in one or the other, the only true thing someone could say is they don't know if there is not, or there is a God. At least that would accord with the lack of evidence one way or the other.
If there is a difference in the faith required to believe one way or the other, I'd be curious to hear about that difference.
Believing in a God (such as the Abrahamic God of Jews, Christians and Muslims) means needing to know (or supposing that you can know) what that means, what it requires of you, what happens if you default -- just an immense amount of stuff, all completely without epistemically justifiable answers.
Believing there is no God of that sort requires -- well, it doesn't require anything else at all, except figuring out who you are and what your life is going to be about in the world you inhabit.