This article discusses some relationships some scientists found between clean thoughts and clean minds and moral behavior, but I think the author missed a hum-dinger of a conclusion, namely, that it is bad people who want religion and we can't win with religion.
In the referenced study, people who thought of bad things then fill in the blanks fill them with moral ideas. People who thought of good things had no such tendency. Bad people want religion to clean them of their sins!
But, in a later study, once given some cleaning, people were less generous. They became mean!
Religion is a sign of badness in the first instance, and a creator of meanness in the second.
For some further reading, try this and this, both from the Not Rocket Science blog.