Bottom line, people lie.
Which is why, again, it should not be treated like a dating app. I would think it would be more a fellowship app, and if peeps want to go in the Noahs Ark direction, that would be something further that they'd need to sign up for, maybe a private thing after they'd gone into a CC app. Of course peeps could just email or phone each other if they wanted - for any reason.
But it should not be the MAIN reason for a Christian singles app. We want fellowship. We just are a bit lonely because there is nobody there living with us who's tied to us. We want to connect with other Christians.
The screening process is basically the intent of it. People don't go on linkedin for no reason. They wanna build their CV and maybe professional networks. Of course there might be scammers on it, just like any site. There is an authorization process. Just as there is on facebook or any other social media site. It just depends on how robust it is. There will be levels (premium) subs if you want more. Or it just may have ads you not interested in. The ads may have no relevance, or they would be algortihms designed to get you to spend etc.
I use a guitar app to tune my guitar. That's it. I'm not interested in anything else. I use whats app to message and talk to people, that I know. That's it. I would use a christian forum or app to connect with other Christians who maybe I can't see in church or live overseas. There's no expectation that I will date them, meet up with them, or marry them.