I just think that people need to put a whole lot more on atheism than there is because it makes them more comfortable.
They lack the internal metaphors necessary to imagine that someone can merely not believe in deities, and the fact that you can not be fundamental about a lack of something.
ETA: People keep confusing materialism, skepticism and antitheism with atheism because most of these people are atheists. But just because they are atheists does not mean that their personal principles are adaptable to be atheist principles. Just like there are atheist Jews, atheist Pagans, atheist witches, atheist shamans, atheist Buddhists...