One of the most irritating things about being an atheist, is when people intentionally try to misconstrue your position as faith-based. It usually comes in the form of an accusation like "You have faith that God doesn't exist", by the time you attempt to correct them, your detractor has usually moved onto something else, or if not they generally seem to ignore you.
I wrote a post last year explaining the positions of atheism and agnosticism and showed why they are not mutually exclusive, because they are essentially dealing with different realms. In short, agnosticism is claiming you do not or cannot have any knowledge pertaining to the existence of god(s), while atheism is a reaction to the claim that god exists.
This 'faith' strawman is rather puzzling, because the accuser is almost always a person who believes in god purely on faith, yet they accuse us of having a faith, as if it was a bad thing. There is no more faith involved in being an atheist that there is in rejecting the validity of homeopathic medicine. Until you show me evidence that your unlikely claim is true, I am going to disbelieve it, which requires no faith on my part