Conservatives made history this year. For the first time, an avowed atheist addressed the Conservative Political Action Conference, or CPAC, the big annual gathering of conservative activists. And atheists occupied an exhibitor’s booth, another first. Jamila Bey, an African American journalist and board member of the group American Atheists, didn’t exactly wow the crowd, for whom professions of religious faith and a belief in God are standard fare. But she wasn’t booed either. For the atheists, long held at arm’s length by Republicans, that’s progress.