Now that Barack Obama has decided to be for the Ground Zero mosque before being implicitly against it (perhaps), discussion about his faith has once again reached a fever pitch. To many, his stance proves he’s a Muslim, with a recent poll showing that almost 20 percent of Americans hold that opinion; to others, it just reflects a desire to be faithful to the Constitution (now, that would be change). The truth, however, is a bit more nuanced. Obama is not religiously Muslim. Culturally, though . . . well, that’s a different matter altogether.