A number of prominent world leaders are avowed atheists and there's no reason the American President has to be religious.
The WikiLeaks publication of emails by the Democratic National Committee revealed that one DNC staffer floated the idea of using Bernie Sanders’s possible atheism against him. While Bernie is officially Jewish, there are reports that he is actually closer to an atheist than a practicing Jew. Bernie himself has denied this accusation. This news begs the question - why is it a kiss of political death to be labeled an “atheist”?