One of the things I find interesting is the arguments used by believers to validate their beliefs, no matter what the belief is.
In the video at the link below, I argue that faith is not the way to truth against the devil which states that faith is necessary to find truth.
Look into John Loftus. In addition to his own books, he has curated several books that are collections of essays by the best thinkers and writers out there.
Carl Sagan's The Demon Haunted World: Science as a Candle in the Dark.
It's not about atheism per se, but as per Wikipedia...
"Sagan provides a skeptical analysis of several examples of what he refers to as superstition, fraud, and pseudoscience such as witches, UFOs, ESP, and faith healing."
“The God Delusion“ by Richard Dawkins is one of my favorites.
Movies: The Unbelievers, Religulous
Books: Sam Harris's Letter to a Christian Nation is probably one of my favorites.
What have you read? I’d hate to repeat the same ones to you while omitting those that may be new to you.