Gay is OK, but Keep Bible Away?

Christians, mostly of the evangelical sort, are forming groups at big corporations. Many corporations allow it. Some don't. Link. Excerpt:

Since the 1980s, employers have allowed workers with common interests – including gays and lesbians, military families, and people of shared ethnic backgrounds – to form "diversity groups." Some companies say the policy has helped the bottom line: Recruitment, retention and productivity have improved as employees have begun to feel more connected to the workplace.
So when Christians started asking to be included in the trend, many companies saw it as an extension of an idea that already had served them well. Some offered not only access to corporate facilities, but also budgets that could run into the thousands of dollars.
"There are intangible benefits," said Tiane Mitchell-Gordon, AOL's director of diversity and inclusion. Companies profit, she said, when their workers are highly engaged.
Yet other firms worried about the effect on workplace comity, not to mention potential lawsuits on grounds of religious harassment. Coca-Cola Co. and General Motors Corp., among others, have refused to recognize religious employee groups, though they allow workers to organize around race, sexual orientation and gender.