What you are describing is "strong" atheism, which asserts that no deities exist; that is indeed a "leap of faith", as it were. On the other hand, there is also "weak" atheism (my position), which is simply a lack of belief in God or gods.
While I do not believe in any deities, I do not explicitly assert that there are none.
Hope this helps clarify things.
This is often referred to as agnostic. Basically saying you are not sure in God's existence and know this existence is improvable.