I've delved into the realm of online dating sites before a few times. I've found that in regards to a Christian going on a secular dating site, it's slim pickins. OkCupid lets you set criteria, and then when only a couple girls meet it, you start to lower your standards. It starts out like "Okay, she has to be Christian, can't smoke, and only light drinking". It moves to "Okay, well maybe someone can be Christian and still smoke and drink". To even "Okay, well she's Catholic and doesn't even mention God in her profile, but maybe we're compatible!"
There are usually one or two serious Christian girls on there that talk about their relationship with Jesus right on their profile. Those girls never responded.
Then there are the Christian dating sites. I've only used one. Most of them only have five or six girls total in your area. Anyway it just so happened that I signed up for a free 3-day trial and immediately met a girl who was also on the three day trial. So we met up for dinner. She was nice, not strange or boring, but I just didn't feel like we had a connection. She was clearly very marriage-focused though, and that's a plus.
In all I've gone on a fair amount of dates with "girls from the internet" and it just didn't work for me. I like the bond that two people create by being friends for a long time, and absolutely no one on dating sites wanted that. Even the ones who listed that they were only there for friendships were clearly turned off by a guy looking for the same. I've pretty much decided that God has someone really awesome for me, but I'm not going to meet her online. Meeting at church is the way to go. Then you immediately know you're both Christian, single, and believe more or less the same doctrine. You have the same group of friends to keep you accountable; it's more of a community.
No hate for those who do choose to find their significant other via the internet; it would just never work for me.