[meelash]

At least for Muslims, there is an obvious flaw since Islam forbids dating. So people that self-identified as "very serious" are pretty much by-definition not that. And since it is, among all the practices of Muslims, one that is popularly known and probably even overemphasized (relative to other practices), a large population of those that self-identified as "somewhat serious" are probably guilty of being a bit generous with themselves.

At the end of the day, of course, correlation does not imply causation. If either religious people get their panties in a bunch and overly-defensive or irreligious people start gloating, both are simply demonstrating that their dogma is overriding their intelligence.