"Find G-d's match for you", isn't that implying that the people who run it know exactly what G-d is thinking? If G-d is unknowable, it's hubristic and sacrilegious to assume you know what they mean. Also, if G-d has already decided all of the matches (Because there's an implication that there is a specific match) has he personally told the Christian Mingle folks the matches? He didn't think to tell them the Powerball numbers or who would win the Preakness?
I don't have a problem with them linking up religious people, but that is a cheap line. And I'm sure it works great.