On a bright and raucous afternoon outside Los Angeles City Hall, Cornel West was revving up a crowd at Occupy L.A. As he often does, the prominent philosopher and activist peppered his speech with religious phrases, at one point calling for recognition of "our prophetic Mormon brothers and sisters," as well as Jews, Muslims, Buddhists and "black Baptists like myself."

The crowd gamely applauded. But the biggest roars came when West called out "the progressive agnostic and atheistic brothers and sisters" — a response that seemed to illuminate the largely secular underpinnings of the Occupy Wall Street movement and a challenge now facing the religious left.

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