That is an interesting point, but I think some of that might be related to the verbiage used on the profiles themselves. I've browsed OKCupid before and noticed that Christian women emphasized "faith" a lot, more so than non-religions persons. I emphasize "faith," because that word tends to appear Christians' profiles more often than not. "Religions/religious" seems to pop up more often in profiles of people who are not part of any religion; i.e. "I am not religious; hate religion; please do not be religious," etc. are some examples I've seen from obeviously atheists/agnostics/other. "I am true to my faith, faithful, my faith is important," etc. are examples from profiles of generally Christian women. I'm a little high, but that's my two cents. Not sure if it makes sense