Posted: May 09, 2010 10:25 pm
by jim
A quick wiki of mental illness brings us this...

Prevalence
Main article: Prevalence of mental disorders

Mental disorders have been found to be common, with more than one in three people in most countries reporting sufficient criteria for at least one diagnosis at some point in their life up to the time they were assessed..... Actual lifetime prevalence rates for mental disorders are estimated to be between 65% and 85%

So..If we go by the poll taken on this site it seems to suggest that atheists are less prone to mental disorders than theists.