Humanists and atheists are not the same, but they are commonly lumped together and there aren’t any large-scale polls separating them, so for this post I too will lump them together.
A candidate for office must get a majority of votes to win, but if 53% are doubtful of a known atheist, even before he states his political goals, it would be nearly impossible for that person to win.
I don’t know why this 2015 poll is so different from the 2014 one, but even in here an Atheist candidate would receive less tolerance than a Muslim candidate, even though we have been at war with Muslim countries for the last two decades. The statistics vary wildly in these questionnaires about atheists and public office, but it is clear that the public is unwilling to trust someone who doesn’t believe in alien beings directing human affairs.
This chart shows that the United States has 38% of the public probably wouldn’t vote for an atheist even before he states his other qualifications or political aspirations. Indonesia which is the fifth largest country in population in the world has 86% claiming someone who doesn’t believe in disembodied spirits is unfit for public office. China, the largest country in the world, isn’t listed but it is probably similar to Vietnam and South Korea and thus would be about 10%. Of all the countries of the world only Sweden seems to be populated by rational beings who wouldn’t consider it essential that a person believe in extraterrestrials directing public officials before they could aspire to public office.
We must find ways to bring rational aspirations to the public, because education isn’t enough to make people think clearly.