What is the Straw Man Fallacy?
The Straw Man fallacy is committed when a person simply ignores a person's actual position and substitutes a distorted, exaggerated or misrepresented version of that position. This sort of "reasoning" has the following pattern:
1. Person A has position X.
2. Person B presents position Y (which is a distorted version of X).
3. Person B attacks position Y.
4. Therefore X is false/incorrect/flawed.
This sort of "reasoning" is fallacious because attacking a distorted version of a position simply does not constitute an attack on the position itself.
Texture by ~blackxwinter
More Stuff to Read:Misconceptions about Atheists
An Introduction to Atheism
That being said, this goes for everyone! Don't use straw man arguments, it's just bad form.