Hah, good one. 

That PEW survey actually shows non-religious folks have higher educational levels. 

http://www.pewforum.org/religious-landscape-study/educational-distribution/college/
atheist 5%, agnostic 6%, nothing in particualr 14% for a total 25%
http://www.pewforum.org/religious-landscape-study/educational-distribution/post-graduate-degree/
atheist 5%, agnostic 6%, nothing in particular 13% for a total of 24%
http://www.pewforum.org/religious-landscape-study/educational-distribution/college/religious-family/nothing-in-particular/
http://www.pewforum.org/religious-landscape-study/educational-distribution/college/religious-family/agnostic/
http://www.pewforum.org/religious-landscape-study/educational-distribution/college/religious-family/atheist/

http://www.pewforum.org/2015/05/12/americas-changing-religious-landscape/
"Religious “nones” now constitute 24% of all college graduates (up from 17%) and 22% of those with less than a college degree (up from 16%)."