Michael Nugent has a wonderful set of rebuttals to common myths people have about atheists. I just love this one:
Myth 2 — Atheism requires faith
Atheism does not require faith. Faith is belief that is disproportionate to the best currently available evidence. Believing that there are no gods, or not believing that there are gods, is proportionate to the best currently available evidence. There is no reasonable evidence to suggest that supernatural gods exist, and there is a lot of reasonable evidence to suggest that humans invented the idea of supernatural gods.
I should mention that Nugent has written these rebuttals before in other venues, but the list on his site is just a nice compilation of everything.
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