Hi Robo!
Thank you so much for thinking of Singles! I can only speak from my own experience, but here's what I've learned from being in the Christian single community for a very long time.
1. I would advocate for paid memberships.
I've been on free sites, and when there's nothing to lose, everyone tries -- including a large number of marrieds, which is why I gave up on free sites. I was also on eharmony, Christian Mingle, and Christian Cafe, and while of course, a paid subscription doesn't solve everything, it's at least a first layer of screening. A recent Google stat estimates that 65% of people on dating apps are married or already in relationships.
A fee might cut down the number of marrieds if Mrs. Sally sees a charge on the credit card bill showing that Mr. Sam just paid for a membership to "ChristianSingles.com."
I know this will upset those who believe all things Christian should be free, especially since a dating app will attract a lot of people who can't/don't work, so if they have better ideas for how to help keep the community safe, I'm certainly open to other ideas.
And I would be all for some kind of donation fund where those who wanted to could help subsidize memberships for anyone having a rough time and couldn't pay.
2. Enforce some sort of screening process to make people verify who they are through photos.
Catfishing is rampant and a big reason why singles give up on these sites
3. Include live chat rooms.
Mingle and Cafe used to have them -- I don't think they do anymore -- and I wouldn't go back to a site without one.
It was a lot easier to get to know people and/or catch them in lies when they had to talk to people in real time, and in a group.
For instance, there was a guy bantering with me one time I entered Mingle chat and another girl wrote me and said, "Just to let you know, he hits on every new girl who comes in. He likes to throw everything at every wall to see if anything sticks." She also told me that several girls were talking to him, and that he never answered questions about his life.
Now I understand there's a fine line between gossip and being informative -- but I definitely wasn't interested in a player. And I would not have known without the chat.
4. If it's discovered that someone is married or in a relationship, how is that handled?
How does administration handle that? And to what extent are members allowed to let others know? If someone puts in their profile, "BY THE WAY, SALLY H. IS ACTUALLY MARRIED!!" -- how far would that go?
5. No one wants to think about this, but I'm the person who, when presented with an idea, will think of everything that can go wrong.
How will reports of abuse/sexual misconduct, whether in word or deed, be handled?
I once heard of a of a sexual assault on a date from Christian Mingle. I don't know to what extent the victim went to when informing the administration, but I was told the perpetrator's account went on as if nothing happened -- possibly endangering others.
I don't know how things like that would be handled, especially from a legal standpoint.
What if you have the victim trying to warn other people, saying, "USERX37 IS A PREDATOR!" I know cases like this will boil down to "He said, She said," but you can count on things like this happening -- even if it's not physical, but someone saying inappropriate things or sending inappropriate photos.
And what happens when you have people who cross the line into stalking, etc.?
I know not every problem can be prevented, but I do know that with a dating app, these problems are going to occur. It's not a matter of if they will happen, but rather, how big they will become.
Thank you for taking the time to ask for our input!
I would be thrilled to feel there was an option for Singles that was truly concerned about honesty and safety.
1 collects to sell to every company who has $. They aren't the only ones, but the ones who replaced their old operation with what used to be the biggest soc media platform. 
