An atheist professor said Tuesday that it's acceptable to criticize Christians but not Muslims, because he does not "fear" retaliation from Christians. "I know what keeps me from critiquing Islam on my blog is just fear," Phil Zuckerman said at a discussion on religious liberty at Georgetown University in Washington, D.C. "I've got three kids. "So I know I can say anything about Christianity or Mormonism, and I'm not living in fear, which is a testament to Christianity and Mormonism, and that's wonderful. Thank you," said Zuckerman, who is a self-described atheist and professor of secular studies at Pitzer College...