Does the U.S. President Need to be Christian?

Dating back to 1787, almost all U.S. presidents have been Christian. So could a non-religious president win the race for the White House?

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Pope Francis Suggests Donald Trump Is 'Not Christian' (nytimes.com)
"Inserting himself into the Republican presidential race, Pope Francis on Wednesday suggested that Donald J. Trump "is not Christian" because of the harshness of his campaign promises to deport more immigrants and force Mexico to pay for a wall along the border."

Almost all U.S. presidents have been Christians (pewresearch.org)
"The U.S. Constitution famously prohibits any religious test or requirement for public office. "

Faith and the 2016 Campaign (pewforum.org)
"The conventional wisdom in American politics has long been that someone who is not religious cannot be elected president of the United States. "

Bernie Sanders: Our first non-religious president? (washingtonpost.com)
"Much of the attention paid to Bernie Sanders's presidential campaign has to do with the s-word: Can a socialist be elected president?"