Does being an atheist make you closed minded?

It's often assumed that people who don't believe in supernatural entities like gods and ghosts are closed minded. However, you can except the possibility of something being true without believing in it. How is that closed minded?
Here's a video I made a while ago in which I argue that being an atheist does not make you closed minded.

Open-mindedness

Have you ever been asked to be more open minded because you don't believe in something? Then this video is for you.