Really, it's a bit cheeky but certainly on brand.
If you're a Christian, then you want nothing more than to believe your romantic partner has been ordained by none other than the holiness himself/herself.
So it a wry move on the part of Christian Mingle to invoke the Lord's endorsement...or at least the imply that matches at its site are nothing short of just that.
Why look anywhere else? You'd just be searching for something that's against the Lord's wishes. And that could have Old Testament consequences. (Better play it safe.)