Earlier quoted context omitted.
Scientifically proven with a reading test based on the lengths of words, and metrics I just made up Actually they're using the Coleman-Liau Index, a computer readability formula going back to 1975.
The metric about adherence was made up and without explanation of how they categorized people. The Coleman-Liau Index is based on lengths of words, which proves... what, exactly? Many of the "most" religious people scored higher than the ones rated "meh". Also, agnostics are in the middle of the pack. So what does this chart predict? That certain self-selected religious categories in their dataset correlate with word…
I especially "enjoyed" the break down by race. They admit that the site is primarily American in demographic, but there is no accounting for language proficiency being a barrier to entry to the site for users from non-English speaking cultures. If you care enough to learn English as a second language to the point where you can use OkCupid, then I expect you will learn to to a greater degree than a minimally literate, native English speaker.