How are atheists a kind of Muslim?

My teachers is making us do papers on different religions and I got assigned atheism. I keep seeing online that a survey says atheists are a kind of muslim but I can't find the survey. Anyone know more on how atheists are a kind of muslim?
Update: OK I'm not interested in atheists apologetics who say they aren't a kind of Muslim. I know they are because my pastor said so and he doesn't lie because he talks to God so does anyone have any real facts or just more atheist propaganda.
Update 2: Still think I'm wrong?

http://en.wikipedia.org/wiki/Category:Muslim_atheists

At least SOME people admit it's real.
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