Skepticism is the approach of doubting every single thing available to one's mind and senses.
Using it leads not to knowledge but to the destruction of knowledge. It leads one to become helpless in having certainty even in the existence of something as concrete a wall.
If a full skeptic does not believe in god, it is not the grace of any rational thought, but simply one more instance of doubting. A full skeptic equally doubts the existence of god and the existence of planet earth.
Knowledge is gained by collecting evidence based on observations of reality, forming generalizations, concepts and conclusions based on what one observes. It is a positive process of building one's knowledge, not a negative destruction of it.
You might ask: Isn't it important to be critical in one's thinking? Yes, but using critical thinking and being skeptic are not the same.
Critical thinking is merely a cautious, careful thinking on a topic - to make sure one's conclusions and knowledge are non-contradictory.
It is not the same as skepticism, which means to doubt all the knowledge one has.
If one uses logic and a positive process of collecting evidence, Atheism follows simply because there is no evidence pointing at the existence of god. There is nothing to doubt or reject since one does not form such a conclusion to begin with.
So in conclusion skepticism is not the proper method on which Atheism is reached. Logic is.