The word religion is sometimes used interchangeably with faith, belief system[3] or sometimes set of duties;[4] however, in the words of Émile Durkheim, religion differs from private belief in that it is "something eminently social".[5] A global 2012 poll reports 59% of the world's population as "religious" and 36% as not religious, including 13% who are atheists, with a 9% decrease in religious belief from 2005.[6] On average, women are "more religious" than men.[7] Some people follow multiple religions or multiple religious principles at the same time, regardless of whether or not the religious principles they follow traditionally allow for syncretism.[8][9][10]