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You just said you don't understand the market this software addresses. Maybe now's a good time to opt out of the conversation. Lots of other conversations are happening on the site, right now, and it looks like all of them are a better fit for you.

Most of the churches I've been to have not had a formal "check in" process, but they do have a membership process (people can be added to the member list, and are then allowed to vote for church leadership committees and such) and cards for guests to fill out if they want to be contacted.

Childcare (nursery) often has a check-in process specifically relating to who is and isn't allowed to pick up your children.

I'm about as militant an antitheist as you're going to meet (even for the UK) and wish we had something like this to organise e.g. BHA Humanist meets/community.