"Atheism is a religion like baldness is a hairstyle." Borrowed from Two Cult Survivor, who says "It's not. But it is. But it's not." He points out that if we accept freedom of religion, the decision not to follow any religion is a "religious choice" deserving of equal respect and noncoercion.
"When a theist claims atheism is a religion, the appropriate response ... is to say 'You do not want me forcing my religion on you or your children, and I do not want you forcing your religion on me or mine.'"