In 2009, the site's founders analyzed responses from more than 500,000 users and discovered that including the word "atheist" in a first message to another user was more likely to garner a reply than any other religious descriptor except Christian.
MORE: http://www.washingtonpost.com/national/on-faith/at-okcupid-being-an-atheist-is-a-date-maker-not-a-deal-breaker/2012/11/13/7d246d82-2dcb-11e2-b631-2aad9d9c73ac_story.html
