What is an example of antihero?

Atheism as an example is this:

1. 'A' in latin means 'without'. 'Theism' means 'study/doctrine/belief in god'. Therefore 'Atheism' would be 'a study/doctrine that believes in the idea that we are without a God'.

2. Everyone is technically an Atheist is some form. Christians don't believe in Zeus and Thor as being Gods so they are Atheists in a certain aspect. Where as I believe there is no God/Gods whatsoever. I am a full Atheist.

3. I can't think of a good metaphor the describe atheistic beliefs. I know someone will come along and either put "chicken poo" here or put something that declines Atheism instead of describing the belief system of Atheists.