Editor's Note: Stephen Prothero, a Boston University religion scholar and author of "God is Not One: The Eight Rival Religions that Run the World," is a regular CNN Belief Blog contributor. By Stephen Prothero, Special to CNN In a commentary on the shrill Republican silence in the face of the "Obama is a Muslim" nonsense, Slate’s John Dickerson wrote that "with so much traffic on the low road in American politics, you'd imagine a politician or two might take the high road simply to beat the congestion." Well, New York City’s Mayor Michael Bloomberg continues to take the road less...