Why are most libertarians atheists?

Most Libertarians ARE NOT atheists, there only 13-16% of this country claim to be atheists so no political philosophy have a majority of atheists, however the reason a much higher amount of libertarians are atheists is because many libertarians become libertarians because of objectivists, and most objectivists are atheists and libertarians, however most libertarians are not atheists or objectivists, hope that helps