http://americanhumanist.org/news/details/2010-04-in-good-we-trust-says-new-humanist-billboard
From the page: “This billboard nicely sums up two of the main messages of the American Humanist Association,” said Roy Speckhardt, executive director of the AHA. “First, that you don’t have to believe in God to be good–in fact, humanists and other nontheists see being good as one of the most important of responsibilities in our one and only life. Second, that church and state should remain separate for the benefit of us all.” Speckhardt argued that “In Good We Trust” is a more inclusive and appropriate sentiment than the “In God We Trust” motto, which runs afoul the First Amendment.