You've never met anyone that had serious faith in their atheism?
Translation:
You've never met anyone that had serious faith in their lack of faith?
Sorta. More like "serious faith that they are superior by virtue of not having the sort of faith that losers and fools have".
The next time you see a debate about religion in person, watch the alleged atheist carefully. I'll bet a dollar that he doesn't have any idea what he is talking about. He probably hasn't ever had a serious thought on the subject, so he isn't expressing that he has considered religion and rejected it. What he is really expressing is a desire to be seen as the sort of person that rejects religion, because rejecting religion is cool, and he wants to be cool.
I know some actual atheists, people that have put serious thought into the matter. In general, they know more about theology than I do. I have a lot of respect for these people.
But for every one of them, I've seen a dozen douchebags in bars that wear designer clothes because they want to be seen as the sort of guy that wears designer clothes, and they talk shit about religion because they want to be seen as the sort of guy that talks shit about religion. They regurgitate talking points that would insult the intelligence of a bright six year old because for them it isn't about thinking, or debating, it is about saying things that are congruent with the image they want to project.
I hope that clears things up.