Pretty sure all the comparisons are case-insensitive. Several are even explicitly stemmed for plurals.

I doubt it. I'm willing to bet that they did a case-insensitive search. Not only does it make more sense for making these charts, it's also the default in SQL and in most full-text search tools.

Then the discrepancy baffles me.

I wonder how well mentioning religion to a person who puts religion on their profile vs mentioning to someone who doesn't compares. They say "Christin" doesn't help as much as atheist, but I would bet that people who put "Christian" in their profile respond more...

On their first post on this subject, I asked if they were going to do some response modelling based not only on the message, but on profile features like spirituality, math ability, desire for love, etc.

No reply, unfortunately.

Maybe khafra should have put "zombie" in the first post?

The main problem, I think, was opening with "hi ur pretty"

OKCupid seems to attract a hipper crowd more likely to not be religious, compared with eHarmony which has a pretty clear Christian vibe to it which would likely attract users who would reply more readily to 'god' than 'atheist'.

Well its probably true that eHarmony will attract more Christians than OkCupid. But I wonder if Christians or atheists are more likely to try OkCupid.

According to Wikipedia, 78.4% of people in the US are Christian.

http://en.wikipedia.org/wiki/Religion_in_the_United_States

I wonder what the numbers show for OkCupid members.

Compare "Oh, hey, I see you're a Christian too." and "I hope we can grow and enjoy God's love together.". The latter seems to connote much more devotion than the former. I would bet that "God" is more likely to be used in a devoted sense than "Christian". I would further bet that the devoted can find each other at church and/or devoted language from a man to a woman in the first contact doesn't come off well. (Disclaimer: poster is an atheist who was raised Christian but does not intend to bash religion in this particular post.)

Might also be because of things like "god damnit, ur hot". I got the feeling that they didn't really look into confounding variables, like common sentences that trigger multiple rules.

Right, that's more or less what I was thinking.

I agree with "I hope we can grow and enjoy God's love together." being a little freaky to tell someone online.

"God" is also sprinkled fairly liberally around some common phrases. "Oh my God" comes to mind, shouldn't be hard to think of a dozen others on your own.

I can't stay if these conditions are accounted for, of course.