DominicCobb said:

Consider this: a man is born in a society completely devoid of religion. He has no concept of a higher power--the thought has never crossed his mind. He is an atheist because he doesn't believe in a God. But does he truly believe there is no God?

You are not the first to ask such a question.

https://en.wikipedia.org/wiki/Implicit_and_explicit_atheism

According to these definitions, such a person is in fact an atheist of the implicit brand. Again, you show that there is no one-size-fits-all definition of atheism.

All this discussion would have been great in a couple of other better threads, i.e. the Atheist thread, the Religion thread, or even the philosophy thread.